* Re: [BUG] i2c: acpi: Dell XPS 17 9720 ELAN 04F3:311C touchpad (VEN_04F3) needs 100 kHz like DLL0945
[not found] <CYQ1dYF3ZUj0L_VRzN490SfuHRaulkT_y5NWcIEIl8OtpIgWgXyOlwEyUqZD_uz9bmVBXM2uLOo8bkyzcR-qCxNObstCqFUlK6lUYXK5euE=@proton.me>
@ 2026-11-09 10:45 ` Mika Westerberg
2026-11-09 20:57 ` penhouse24
0 siblings, 1 reply; 4+ messages in thread
From: Mika Westerberg @ 2026-11-09 10:45 UTC (permalink / raw)
To: penhouse24
Cc: westeri@kernel.org, andi.shyti@kernel.org,
linux-i2c@vger.kernel.org, linux-acpi@vger.kernel.org
Hi,
On Fri, Nov 06, 2026 at 05:48:02PM +0000, penhouse24@proton.me wrote:
> Hi Mika, Andi,
>
> The ELAN 04F3:311C touchpad in the Dell XPS 17 9720 intermittently becomes
> sluggish and sticky for several seconds to minutes, then recovers. I dual boot
> with Windows and I do not experience this issue on Windows, only on Linux and
> across multiple distros (Linux mint, Ubuntu and Pop_os). I'm not the only one
> who experiences this issue; it seems to be widespread among Dell XPS users.
> This looks like the excessive-smoothing issue fixed for the Precision 5560 by
> commit 0b7c9528facd (“i2c: Force DLL0945 touchpad i2c freq to 100khz”). The
> Precision 5560 uses the same 04F3:311C touchpad. On the XPS 17 9720, the
> firmware exposes it with _HID “VEN_04F3” instead of “DLL0945”, so the existing
> quirk doesn’t apply.
>
> Forcing the bus to 100 kHz fixes it here. The DSDT already supports 100 kHz:
> _SB.PC00.I2C1.TPD0._INI sets SPED from the TPDS NVS variable (0 = 100 kHz, 1 =
> 400 kHz, 2 = 1 MHz), and this firmware uses TPDS = 1. To test it, I loaded an
> SSDT through configfs that sets _SB.PC00.I2C1.TPD0.SPED = 0x186A0 and rebound
> i2c_designware.1. After 5 days of use, including on AC power, the lag has not
> come back. Without the override, it returns as randomly as before.
>
> System:
>
> • Dell XPS 17 9720, BIOS 1.41.0
> • Touchpad: VEN_04F3:00 04F3:311C on i2c_designware.1 (_SB.PC00.I2C1.TPD0),
> touchpad firmware 0x000b
> • Kernel: 7.2.15-76070215-generic
>
> Adding “VEN_04F3” to i2c_acpi_force_100khz_device_ids would fix this machine.
> However, VEN_04F3 looks like a generic vendor ID rather than a model-specific
> one like DLL0945, so it may need to be limited to this model with a DMI match.
> I’m happy to test a patch.
That VEN_04F3 is not even a valid ACPI/PNP ID. Have you checked if there is
a BIOS upgrade for your system?
It's odd that Dell would use identifier like this as they typically follow
these pretty well. Anyways if there is no BIOS upgrade (or if it does not
change anything) then I don't see much other option than adding a quirk. I
do see there is one quirk added already for GPIO side on Dell system with
VEN_0488 entry (drivers/gpio/gpiolib-acpi-quirks.c).
In that case we would need output of 'sudo dmidecode' to be able to add the
DMI strings.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [BUG] i2c: acpi: Dell XPS 17 9720 ELAN 04F3:311C touchpad (VEN_04F3) needs 100 kHz like DLL0945
2026-11-09 10:45 ` [BUG] i2c: acpi: Dell XPS 17 9720 ELAN 04F3:311C touchpad (VEN_04F3) needs 100 kHz like DLL0945 Mika Westerberg
@ 2026-11-09 20:57 ` penhouse24
2026-11-11 7:59 ` Mika Westerberg
0 siblings, 1 reply; 4+ messages in thread
From: penhouse24 @ 2026-11-09 20:57 UTC (permalink / raw)
To: Mika Westerberg
Cc: westeri@kernel.org, andi.shyti@kernel.org,
linux-i2c@vger.kernel.org, linux-acpi@vger.kernel.org
[-- Attachment #1: Type: text/plain, Size: 3279 bytes --]
Hi Mika,
Thank you for the response (I honestly wasn't expecting anyone to respond for this niche issue---so a welcome surprise).
Yes my BIOS version (v1.41.0) is up to date. Currently, there are no updates available through Windows or from fwupd. I have received BIOS updates many times via Windows since purchasing this computer in 2022 and have had 0 change to this problem.
For what it’s worth, the DSDT has a valid default ID. TPD0 starts with Name (ITPN, “DELL0AFF”), and _INI then overwrites it from the BIOS-provided TPHD variable, which yields “VEN_04F3”.
Please find attached the output of 'sudo dmidecode'.
Thank you for helping me fix this.
On Monday, November 9th, 2026 at 5:45 AM, Mika Westerberg <mika.westerberg@linux.intel.com> wrote:
> Hi,
>
> On Fri, Nov 06, 2026 at 05:48:02PM +0000, penhouse24@proton.me wrote:
> > Hi Mika, Andi,
> >
> > The ELAN 04F3:311C touchpad in the Dell XPS 17 9720 intermittently becomes
> > sluggish and sticky for several seconds to minutes, then recovers. I dual boot
> > with Windows and I do not experience this issue on Windows, only on Linux and
> > across multiple distros (Linux mint, Ubuntu and Pop_os). I'm not the only one
> > who experiences this issue; it seems to be widespread among Dell XPS users.
> > This looks like the excessive-smoothing issue fixed for the Precision 5560 by
> > commit 0b7c9528facd (“i2c: Force DLL0945 touchpad i2c freq to 100khz”). The
> > Precision 5560 uses the same 04F3:311C touchpad. On the XPS 17 9720, the
> > firmware exposes it with _HID “VEN_04F3” instead of “DLL0945”, so the existing
> > quirk doesn’t apply.
> >
> > Forcing the bus to 100 kHz fixes it here. The DSDT already supports 100 kHz:
> > _SB.PC00.I2C1.TPD0._INI sets SPED from the TPDS NVS variable (0 = 100 kHz, 1 =
> > 400 kHz, 2 = 1 MHz), and this firmware uses TPDS = 1. To test it, I loaded an
> > SSDT through configfs that sets _SB.PC00.I2C1.TPD0.SPED = 0x186A0 and rebound
> > i2c_designware.1. After 5 days of use, including on AC power, the lag has not
> > come back. Without the override, it returns as randomly as before.
> >
> > System:
> >
> > • Dell XPS 17 9720, BIOS 1.41.0
> > • Touchpad: VEN_04F3:00 04F3:311C on i2c_designware.1 (_SB.PC00.I2C1.TPD0),
> > touchpad firmware 0x000b
> > • Kernel: 7.2.15-76070215-generic
> >
> > Adding “VEN_04F3” to i2c_acpi_force_100khz_device_ids would fix this machine.
> > However, VEN_04F3 looks like a generic vendor ID rather than a model-specific
> > one like DLL0945, so it may need to be limited to this model with a DMI match.
> > I’m happy to test a patch.
>
> That VEN_04F3 is not even a valid ACPI/PNP ID. Have you checked if there is
> a BIOS upgrade for your system?
>
> It's odd that Dell would use identifier like this as they typically follow
> these pretty well. Anyways if there is no BIOS upgrade (or if it does not
> change anything) then I don't see much other option than adding a quirk. I
> do see there is one quirk added already for GPIO side on Dell system with
> VEN_0488 entry (drivers/gpio/gpiolib-acpi-quirks.c).
>
> In that case we would need output of 'sudo dmidecode' to be able to add the
> DMI strings.
>
[-- Attachment #2: dmidecode.out --]
[-- Type: application/octet-stream, Size: 29217 bytes --]
# dmidecode 3.6
Getting SMBIOS data from sysfs.
SMBIOS 3.4 present.
83 structures occupying 5899 bytes.
Table at 0x5D447000.
Handle 0xDA00, DMI type 218, 251 bytes
OEM-specific Type
Header and Data:
DA FB 00 DA B2 00 7C FF 1F B6 50 1E 00 1E 00 00
00 22 00 22 00 01 00 23 00 23 00 00 00 28 00 28
00 00 00 29 00 29 00 01 00 2A 00 2A 00 02 00 2B
00 2B 00 FF FF 2C 00 2C 00 FF FF 2D 00 2D 00 02
00 2E 00 2E 00 00 00 42 00 42 00 01 00 43 00 43
00 00 00 50 00 50 00 01 00 55 00 55 00 00 00 6D
00 6D 00 05 00 6E 00 6E 00 01 00 7D 00 7D 00 FF
FF 90 00 90 00 01 00 91 00 91 00 00 00 92 00 92
00 02 00 93 00 93 00 01 00 94 00 94 00 00 00 9B
00 9B 00 01 00 9C 00 9C 00 00 00 9F 00 9F 00 00
00 A0 00 A0 00 01 00 A1 00 A1 00 00 00 A3 00 A3
00 01 00 D1 00 D1 00 01 00 D2 00 D2 00 00 00 EA
00 EA 00 00 00 EB 00 EB 00 01 00 EC 00 EC 00 02
00 ED 00 ED 00 00 00 F0 00 F0 00 01 00 09 01 09
01 00 00 0E 01 0E 01 01 00 0F 01 0F 01 00 00 27
01 27 01 03 00 FF FF FF FF 00 00
Handle 0xDA01, DMI type 218, 251 bytes
OEM-specific Type
Header and Data:
DA FB 01 DA B2 00 7C FF 1F B6 50 2B 01 2B 01 01
00 2C 01 2C 01 00 00 35 01 35 01 FF 00 38 01 38
01 01 00 39 01 39 01 02 00 44 01 44 01 00 00 45
01 45 01 01 00 4A 01 4A 01 00 00 4B 01 4B 01 01
00 4C 01 4C 01 01 00 52 01 52 01 01 00 53 01 53
01 00 00 7F 01 7F 01 00 00 80 01 80 01 01 00 89
01 89 01 00 00 8A 01 8A 01 01 00 9B 01 9B 01 00
00 9C 01 9C 01 01 00 DE 01 DE 01 00 00 DF 01 DF
01 01 00 E1 01 E1 01 00 00 EA 01 EA 01 00 00 EB
01 EB 01 01 00 04 02 04 02 00 00 05 02 05 02 01
00 13 02 13 02 00 00 14 02 14 02 01 00 4B 02 4B
02 01 00 4C 02 4C 02 00 00 64 02 64 02 01 00 65
02 65 02 00 00 66 02 66 02 01 00 67 02 67 02 00
00 68 02 68 02 01 00 69 02 69 02 00 00 6C 02 6C
02 01 00 6D 02 6D 02 00 00 85 02 85 02 01 00 86
02 86 02 00 00 FF FF FF FF 00 00
Handle 0xDA02, DMI type 218, 251 bytes
OEM-specific Type
Header and Data:
DA FB 02 DA B2 00 7C FF 1F B6 50 A7 02 A7 02 01
00 A8 02 A8 02 00 00 BD 02 BD 02 01 00 BE 02 BE
02 00 00 D8 02 D8 02 FF FF D9 02 D9 02 FF FF DA
02 DA 02 FF FF DB 02 DB 02 FF FF DC 02 DC 02 FF
FF DD 02 DD 02 FF FF DE 02 DE 02 FF FF DF 02 DF
02 FF FF E3 02 E3 02 01 00 E4 02 E4 02 00 00 EB
02 EB 02 06 00 F6 02 F6 02 08 00 12 03 12 03 03
00 13 03 13 03 01 00 14 03 14 03 00 00 15 03 15
03 01 00 16 03 16 03 00 00 17 03 17 03 01 00 18
03 18 03 00 00 19 03 19 03 01 00 1A 03 1A 03 00
00 1B 03 1B 03 01 00 1C 03 1C 03 00 00 1D 03 1D
03 01 00 1E 03 1E 03 00 00 1F 03 1F 03 01 00 20
03 20 03 00 00 26 03 26 03 01 00 2B 03 2B 03 01
00 2C 03 2C 03 00 00 41 03 41 03 03 00 42 03 42
03 04 00 43 03 43 03 05 00 46 03 46 03 01 00 47
03 47 03 02 00 FF FF FF FF 00 00
Handle 0xDA03, DMI type 218, 251 bytes
OEM-specific Type
Header and Data:
DA FB 03 DA B2 00 7C FF 1F B6 50 48 03 48 03 05
00 49 03 49 03 FF FF 4A 03 4A 03 FF FF 4F 03 4F
03 01 00 50 03 50 03 00 00 61 03 61 03 01 00 62
03 62 03 00 00 67 03 67 03 FF FF 6C 03 6C 03 00
00 6D 03 6D 03 01 00 6E 03 6E 03 FF FF 74 03 74
03 00 00 75 03 75 03 01 00 78 03 78 03 01 00 79
03 79 03 00 00 A2 03 A2 03 01 00 A3 03 A3 03 00
00 BE 03 BE 03 FF FF C6 03 C6 03 00 00 C7 03 C7
03 01 00 C8 03 C8 03 02 00 C9 03 C9 03 01 00 CA
03 CA 03 00 00 CB 03 CB 03 FF FF CD 03 CD 03 01
00 CE 03 CE 03 00 00 D3 03 D3 03 FF FF D6 03 D6
03 01 00 D7 03 D7 03 00 00 F6 03 F6 03 01 00 F7
03 F7 03 00 00 FE 03 FE 03 01 00 FF 03 FF 03 00
00 01 04 01 04 01 00 02 04 02 04 00 00 03 04 03
04 01 00 04 04 04 04 00 00 2B 04 2B 04 FF FF 31
04 31 04 FF FF FF FF FF FF 00 00
Handle 0xDA04, DMI type 218, 251 bytes
OEM-specific Type
Header and Data:
DA FB 04 DA B2 00 7C FF 1F B6 50 32 04 32 04 01
00 33 04 33 04 00 00 36 04 36 04 01 00 37 04 37
04 00 00 38 04 38 04 01 00 39 04 39 04 00 00 40
04 40 04 01 00 41 04 41 04 00 00 42 04 42 04 01
00 43 04 43 04 00 00 46 04 46 04 01 00 47 04 47
04 00 00 4B 04 4B 04 01 00 4C 04 4C 04 00 00 4D
04 4D 04 00 00 4E 04 4E 04 01 00 4F 04 4F 04 02
00 51 04 51 04 FF FF 52 04 52 04 FF FF 53 04 53
04 01 00 54 04 54 04 00 00 61 04 61 04 01 00 62
04 62 04 00 00 68 04 68 04 01 00 69 04 69 04 00
00 7B 04 7B 04 01 00 7C 04 7C 04 00 00 80 04 80
04 01 00 81 04 81 04 00 00 87 04 87 04 01 00 88
04 88 04 00 00 89 04 89 04 FF FF 8C 04 8C 04 01
00 8D 04 8D 04 00 00 98 04 98 04 FF FF 99 04 99
04 00 00 9B 04 9B 04 02 00 9C 04 9C 04 01 00 9D
04 9D 04 00 00 FF FF FF FF 00 00
Handle 0xDA05, DMI type 218, 251 bytes
OEM-specific Type
Header and Data:
DA FB 05 DA B2 00 7C FF 1F B6 50 9E 04 9E 04 01
00 9F 04 9F 04 00 00 A0 04 A0 04 01 00 A1 04 A1
04 00 00 A3 04 A3 04 00 00 AC 04 AC 04 01 00 AD
04 AD 04 00 00 AE 04 AE 04 01 00 AF 04 AF 04 00
00 D9 04 D9 04 00 00 DA 04 DA 04 05 00 DB 04 DB
04 07 00 DC 04 DC 04 FF FF E0 04 E0 04 01 00 E1
04 E1 04 00 00 E2 04 E2 04 01 00 E3 04 E3 04 00
00 E6 04 E6 04 01 00 E7 04 E7 04 00 00 EC 04 EC
04 01 00 ED 04 ED 04 00 00 00 05 00 05 FF FF 12
05 12 05 00 00 13 05 13 05 01 00 14 05 14 05 02
00 15 05 15 05 01 00 1A 05 1A 05 01 00 1B 05 1B
05 00 00 30 05 30 05 01 00 31 05 31 05 00 00 47
05 47 05 00 00 48 05 48 05 01 00 4E 05 4E 05 01
00 4F 05 4F 05 00 00 58 05 58 05 01 00 59 05 59
05 00 00 5A 05 5A 05 01 00 5B 05 5B 05 00 00 5C
05 5C 05 01 00 FF FF FF FF 00 00
Handle 0xDA06, DMI type 218, 233 bytes
OEM-specific Type
Header and Data:
DA E9 06 DA B2 00 7C FF 1F B6 50 5D 05 5D 05 00
00 5E 05 5E 05 01 00 5F 05 5F 05 00 00 60 05 60
05 FF FF 61 05 61 05 01 00 62 05 62 05 00 00 65
05 65 05 FF FF 6D 05 6D 05 01 00 6E 05 6E 05 00
00 72 05 72 05 00 00 73 05 73 05 01 00 74 05 74
05 02 00 77 05 77 05 FF FF 80 05 80 05 FF FF 81
05 81 05 01 00 82 05 82 05 00 00 87 05 87 05 00
00 88 05 88 05 01 00 89 05 89 05 02 00 91 05 91
05 03 00 92 05 92 05 04 00 4A 40 4A 40 01 00 4B
40 4B 40 00 00 4C 40 4C 40 FF FF 4F 40 4F 40 01
00 50 40 50 40 00 00 00 80 00 80 00 00 02 80 02
80 02 00 03 80 03 80 03 00 0E 80 0E 80 01 00 0F
80 0F 80 FF FF 12 80 12 80 FF FF 13 80 13 80 00
00 14 80 14 80 00 00 00 A0 00 A0 01 00 04 A0 04
A0 01 00 FF FF FF FF 00 00
Handle 0xDA07, DMI type 218, 113 bytes
OEM-specific Type
Header and Data:
DA 71 07 DA B2 00 7C FF 1F B6 50 00 F1 00 F1 01
00 02 F1 02 F1 01 00 10 F1 10 F1 01 00 12 F1 12
F1 01 00 20 F1 20 F1 01 00 22 F1 22 F1 01 00 30
F1 30 F1 01 00 32 F1 32 F1 01 00 40 F1 40 F1 01
00 42 F1 42 F1 01 00 50 F1 50 F1 01 00 52 F1 52
F1 01 00 00 F6 00 F6 01 00 01 F6 01 F6 01 00 10
F6 10 F6 01 00 11 F6 11 F6 01 00 FF FF FF FF 00
00
Handle 0x0000, DMI type 0, 26 bytes
BIOS Information
Vendor: Dell Inc.
Version: 1.41.0
Release Date: 05/28/2026
ROM Size: 32 MB
Characteristics:
PCI is supported
PNP is supported
BIOS is upgradeable
BIOS shadowing is allowed
Boot from CD is supported
Selectable boot is supported
EDD is supported
Print screen service is supported (int 5h)
8042 keyboard services are supported (int 9h)
Serial services are supported (int 14h)
Printer services are supported (int 17h)
ACPI is supported
USB legacy is supported
Smart battery is supported
BIOS boot specification is supported
Function key-initiated network boot is supported
Targeted content distribution is supported
UEFI is supported
BIOS Revision: 1.41
Firmware Revision: 1.7
Handle 0x0100, DMI type 1, 27 bytes
System Information
Manufacturer: Dell Inc.
Product Name: XPS 17 9720
Version: Not Specified
Serial Number: 8N0THS3
UUID: 4c4c4544-004e-3010-8054-b8c04f485333
Wake-up Type: Other
SKU Number: 0AFF
Family: XPS
Handle 0x0200, DMI type 2, 17 bytes
Base Board Information
Manufacturer: Dell Inc.
Product Name: 0W7GHH
Version: A00
Serial Number: /8N0THS3/CNWSC003240CBR/
Asset Tag: Not Specified
Features:
Board is a hosting board
Board is replaceable
Location In Chassis: Not Specified
Chassis Handle: 0x0300
Type: Motherboard
Contained Object Handles: 0
Handle 0x0300, DMI type 3, 22 bytes
Chassis Information
Manufacturer: Dell Inc.
Type: Notebook
Lock: Not Present
Version: Not Specified
Serial Number: 8N0THS3
Asset Tag: Not Specified
Boot-up State: Safe
Power Supply State: Safe
Thermal State: Safe
Security Status: None
OEM Information: 0x00000000
Height: Unspecified
Number Of Power Cords: 1
Contained Elements: 0
SKU Number: Notebook
Handle 0x0400, DMI type 4, 48 bytes
Processor Information
Socket Designation: U3E1
Type: Central Processor
Family: Core i9
Manufacturer: Intel(R) Corporation
ID: A3 06 09 00 FF FB EB BF
Signature: Type 0, Family 6, Model 154, Stepping 3
Flags:
FPU (Floating-point unit on-chip)
VME (Virtual mode extension)
DE (Debugging extension)
PSE (Page size extension)
TSC (Time stamp counter)
MSR (Model specific registers)
PAE (Physical address extension)
MCE (Machine check exception)
CX8 (CMPXCHG8 instruction supported)
APIC (On-chip APIC hardware supported)
SEP (Fast system call)
MTRR (Memory type range registers)
PGE (Page global enable)
MCA (Machine check architecture)
CMOV (Conditional move instruction supported)
PAT (Page attribute table)
PSE-36 (36-bit page size extension)
CLFSH (CLFLUSH instruction supported)
DS (Debug store)
ACPI (ACPI supported)
MMX (MMX technology supported)
FXSR (FXSAVE and FXSTOR instructions supported)
SSE (Streaming SIMD extensions)
SSE2 (Streaming SIMD extensions 2)
SS (Self-snoop)
HTT (Multi-threading)
TM (Thermal monitor supported)
PBE (Pending break enabled)
Version: 12th Gen Intel(R) Core(TM) i9-12900HK
Voltage: 1.1 V
External Clock: 100 MHz
Max Speed: 5000 MHz
Current Speed: 3960 MHz
Status: Populated, Enabled
Upgrade: Other
L1 Cache Handle: 0x0705
L2 Cache Handle: 0x0706
L3 Cache Handle: 0x0707
Serial Number:
Asset Tag:
Part Number:
Core Count: 14
Core Enabled: 14
Thread Count: 20
Characteristics:
64-bit capable
Multi-Core
Hardware Thread
Execute Protection
Enhanced Virtualization
Power/Performance Control
Handle 0x0700, DMI type 7, 27 bytes
Cache Information
Socket Designation: L1 Cache
Configuration: Enabled, Not Socketed, Level 1
Operational Mode: Write Back
Location: Internal
Installed Size: 288 kB
Maximum Size: 288 kB
Supported SRAM Types:
Synchronous
Installed SRAM Type: Synchronous
Speed: Unknown
Error Correction Type: Parity
System Type: Data
Associativity: 12-way Set-associative
Handle 0x0701, DMI type 7, 27 bytes
Cache Information
Socket Designation: L1 Cache
Configuration: Enabled, Not Socketed, Level 1
Operational Mode: Write Back
Location: Internal
Installed Size: 192 kB
Maximum Size: 192 kB
Supported SRAM Types:
Synchronous
Installed SRAM Type: Synchronous
Speed: Unknown
Error Correction Type: Parity
System Type: Instruction
Associativity: 8-way Set-associative
Handle 0x0702, DMI type 7, 27 bytes
Cache Information
Socket Designation: L2 Cache
Configuration: Enabled, Not Socketed, Level 2
Operational Mode: Write Back
Location: Internal
Installed Size: 7680 kB
Maximum Size: 7680 kB
Supported SRAM Types:
Synchronous
Installed SRAM Type: Synchronous
Speed: Unknown
Error Correction Type: Single-bit ECC
System Type: Unified
Associativity: Other
Handle 0x0703, DMI type 7, 27 bytes
Cache Information
Socket Designation: L3 Cache
Configuration: Enabled, Not Socketed, Level 3
Operational Mode: Write Back
Location: Internal
Installed Size: 24 MB
Maximum Size: 24 MB
Supported SRAM Types:
Synchronous
Installed SRAM Type: Synchronous
Speed: Unknown
Error Correction Type: Multi-bit ECC
System Type: Unified
Associativity: 12-way Set-associative
Handle 0x0704, DMI type 7, 27 bytes
Cache Information
Socket Designation: L1 Cache
Configuration: Enabled, Not Socketed, Level 1
Operational Mode: Write Back
Location: Internal
Installed Size: 256 kB
Maximum Size: 256 kB
Supported SRAM Types:
Synchronous
Installed SRAM Type: Synchronous
Speed: Unknown
Error Correction Type: Parity
System Type: Data
Associativity: 8-way Set-associative
Handle 0x0705, DMI type 7, 27 bytes
Cache Information
Socket Designation: L1 Cache
Configuration: Enabled, Not Socketed, Level 1
Operational Mode: Write Back
Location: Internal
Installed Size: 512 kB
Maximum Size: 512 kB
Supported SRAM Types:
Synchronous
Installed SRAM Type: Synchronous
Speed: Unknown
Error Correction Type: Parity
System Type: Instruction
Associativity: 8-way Set-associative
Handle 0x0706, DMI type 7, 27 bytes
Cache Information
Socket Designation: L2 Cache
Configuration: Enabled, Not Socketed, Level 2
Operational Mode: Write Back
Location: Internal
Installed Size: 4 MB
Maximum Size: 4 MB
Supported SRAM Types:
Synchronous
Installed SRAM Type: Synchronous
Speed: Unknown
Error Correction Type: Single-bit ECC
System Type: Unified
Associativity: 16-way Set-associative
Handle 0x0707, DMI type 7, 27 bytes
Cache Information
Socket Designation: L3 Cache
Configuration: Enabled, Not Socketed, Level 3
Operational Mode: Write Back
Location: Internal
Installed Size: 24 MB
Maximum Size: 24 MB
Supported SRAM Types:
Synchronous
Installed SRAM Type: Synchronous
Speed: Unknown
Error Correction Type: Multi-bit ECC
System Type: Unified
Associativity: 12-way Set-associative
Handle 0x0900, DMI type 9, 28 bytes
System Slot Information
Designation: PCI-Express 0
Type: PCI Express x16
Data Bus Width: 16x or x16
Current Usage: In Use
Length: Long
ID: 0
Characteristics:
3.3 V is provided
PME signal is supported
Hot-plug devices are supported
SMBus signal is supported
Bus Address: 0000:00:1c.0
Data Bus Width (Base): 0
Peer Devices: 0
Height: Not applicable
Handle 0x0901, DMI type 9, 28 bytes
System Slot Information
Designation: PCI-Express 1
Type: PCI Express
Data Bus Width: 1x or x1
Current Usage: Available
Length: Long
ID: 1
Characteristics:
3.3 V is provided
PME signal is supported
Hot-plug devices are supported
SMBus signal is supported
Bus Address: 0000:00:1c.1
Data Bus Width (Base): 0
Peer Devices: 0
Height: Not applicable
Handle 0x0902, DMI type 9, 28 bytes
System Slot Information
Designation: PCI-Express 2
Type: PCI Express
Data Bus Width: 1x or x1
Current Usage: Available
Length: Long
ID: 2
Characteristics:
3.3 V is provided
PME signal is supported
Hot-plug devices are supported
SMBus signal is supported
Bus Address: 0000:00:1c.2
Data Bus Width (Base): 0
Peer Devices: 0
Height: Not applicable
Handle 0x0903, DMI type 9, 28 bytes
System Slot Information
Designation: PCI-Express 3
Type: PCI Express
Data Bus Width: 1x or x1
Current Usage: Available
Length: Long
ID: 3
Characteristics:
3.3 V is provided
PME signal is supported
Hot-plug devices are supported
SMBus signal is supported
Bus Address: 0000:00:1c.3
Data Bus Width (Base): 0
Peer Devices: 0
Height: Not applicable
Handle 0x0904, DMI type 9, 28 bytes
System Slot Information
Designation: PCI-Express 4
Type: PCI Express
Data Bus Width: 1x or x1
Current Usage: In Use
Length: Long
ID: 4
Characteristics:
3.3 V is provided
PME signal is supported
Hot-plug devices are supported
SMBus signal is supported
Bus Address: 0000:00:1c.4
Data Bus Width (Base): 0
Peer Devices: 0
Height: Not applicable
Handle 0x0905, DMI type 9, 28 bytes
System Slot Information
Designation: PCI-Express 5
Type: PCI Express
Data Bus Width: 1x or x1
Current Usage: Available
Length: Long
ID: 5
Characteristics:
3.3 V is provided
PME signal is supported
Hot-plug devices are supported
SMBus signal is supported
Bus Address: 0000:00:1c.5
Data Bus Width (Base): 0
Peer Devices: 0
Height: Not applicable
Handle 0x0906, DMI type 9, 28 bytes
System Slot Information
Designation: PCI-Express 6
Type: PCI Express
Data Bus Width: 1x or x1
Current Usage: Available
Length: Long
ID: 6
Characteristics:
3.3 V is provided
PME signal is supported
Hot-plug devices are supported
SMBus signal is supported
Bus Address: 0000:00:1c.6
Data Bus Width (Base): 0
Peer Devices: 0
Height: Not applicable
Handle 0x0B00, DMI type 11, 5 bytes
OEM Strings
String 1: Dell System
String 2: 1[0AFF]
String 3: 3[1.0]
String 4: 12[www.dell.com]
String 5: 14[1]
String 6: 15[0]
String 7: 27[18806356803]
Handle 0x0C00, DMI type 12, 5 bytes
System Configuration Options
Option 1: J6H1:1-X Boot with Default; J8H1:1-X BIOS RECOVERY
Handle 0x0D00, DMI type 13, 22 bytes
BIOS Language Information
Language Description Format: Abbreviated
Installable Languages: 1
enUS
Currently Installed Language: enUS
Handle 0x0E00, DMI type 14, 8 bytes
Group Associations
Name: $MEI
Items: 1
0x0000 (OEM-specific)
Handle 0x0E01, DMI type 14, 26 bytes
Group Associations
Name: Firmware Version Info
Items: 7
0xCD00 (OEM-specific)
0xCD01 (OEM-specific)
0xCD02 (OEM-specific)
0xCD03 (OEM-specific)
0xCD04 (OEM-specific)
0xCD05 (OEM-specific)
0xCD06 (OEM-specific)
Handle 0x1000, DMI type 16, 23 bytes
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: None
Maximum Capacity: 64 GB
Error Information Handle: Not Provided
Number Of Devices: 2
Handle 0x1100, DMI type 17, 92 bytes
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 16 GB
Form Factor: SODIMM
Set: None
Locator: DIMM 1
Bank Locator: BANK 0
Type: DDR5
Type Detail: Synchronous
Speed: 4800 MT/s
Manufacturer: 80AD000080AD
Serial Number: 86ED3BF7
Asset Tag: 01223800
Part Number: HMCG78MEBSA095N
Rank: 1
Configured Memory Speed: 4800 MT/s
Minimum Voltage: Unknown
Maximum Voltage: Unknown
Configured Voltage: 1.1 V
Memory Technology: DRAM
Memory Operating Mode Capability: Volatile memory
Firmware Version: Not Specified
Module Manufacturer ID: Bank 1, Hex 0xAD
Module Product ID: Unknown
Memory Subsystem Controller Manufacturer ID: Unknown
Memory Subsystem Controller Product ID: Unknown
Non-Volatile Size: None
Volatile Size: 16 GB
Cache Size: None
Logical Size: None
Handle 0x1101, DMI type 17, 92 bytes
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 16 GB
Form Factor: SODIMM
Set: None
Locator: DIMM 2
Bank Locator: BANK 0
Type: DDR5
Type Detail: Synchronous
Speed: 4800 MT/s
Manufacturer: 80AD000080AD
Serial Number: 76166D2F
Asset Tag: 01224000
Part Number: HMCG78MEBSA095N
Rank: 1
Configured Memory Speed: 4800 MT/s
Minimum Voltage: Unknown
Maximum Voltage: Unknown
Configured Voltage: 1.1 V
Memory Technology: DRAM
Memory Operating Mode Capability: Volatile memory
Firmware Version: Not Specified
Module Manufacturer ID: Bank 1, Hex 0xAD
Module Product ID: Unknown
Memory Subsystem Controller Manufacturer ID: Unknown
Memory Subsystem Controller Product ID: Unknown
Non-Volatile Size: None
Volatile Size: 16 GB
Cache Size: None
Logical Size: None
Handle 0x1300, DMI type 19, 31 bytes
Memory Array Mapped Address
Starting Address: 0x00000000000
Ending Address: 0x007FFFFFFFF
Range Size: 32 GB
Physical Array Handle: 0x1000
Partition Width: 2
Handle 0x1500, DMI type 21, 7 bytes
Built-in Pointing Device
Type: Touch Pad
Interface: Bus Mouse
Buttons: 2
Handle 0x1600, DMI type 22, 26 bytes
Portable Battery
Location: Sys. Battery Bay
Manufacturer: SMP
Manufacture Date: 03/21/2024
Serial Number: 0208
Name: DELL 01RR343
Design Capacity: 95050 mWh
Design Voltage: 11400 mV
SBDS Version: 1.0
Maximum Error: 2%
SBDS Chemistry: LiP
OEM-specific Information: 0x00000801
Handle 0x1900, DMI type 25, 9 bytes
System Power Controls
Next Scheduled Power-on: *-* 00:00:00
Handle 0x1B00, DMI type 27, 15 bytes
Cooling Device
Type: Fan
Status: OK
OEM-specific Information: 0x0000DD00
Nominal Speed: 4200 rpm
Description: Processor Fan
Handle 0x1B01, DMI type 27, 15 bytes
Cooling Device
Type: Fan
Status: OK
OEM-specific Information: 0x0000DD01
Nominal Speed: 4200 rpm
Description: Video Fan
Handle 0x1C00, DMI type 28, 22 bytes
Temperature Probe
Description: CPU
Location: Processor Module
Status: OK
Maximum Value: 127.0 deg C
Minimum Value: -127.0 deg C
Resolution: 1.000 deg C
Tolerance: Unknown
Accuracy: Unknown
OEM-specific Information: 0x0000DC00
Nominal Value: 10.0 deg C
Handle 0x1C01, DMI type 28, 22 bytes
Temperature Probe
Description: NB
Location: Other
Status: OK
Maximum Value: 127.0 deg C
Minimum Value: -127.0 deg C
Resolution: 1.000 deg C
Tolerance: Unknown
Accuracy: Unknown
OEM-specific Information: 0x0000DC01
Nominal Value: 10.0 deg C
Handle 0x1C02, DMI type 28, 22 bytes
Temperature Probe
Description: OTHER
Location: Other
Status: OK
Maximum Value: 127.0 deg C
Minimum Value: -127.0 deg C
Resolution: 1.000 deg C
Tolerance: Unknown
Accuracy: Unknown
OEM-specific Information: 0x0000DC02
Nominal Value: 10.0 deg C
Handle 0x1C03, DMI type 28, 22 bytes
Temperature Probe
Description: OTHER
Location: Other
Status: OK
Maximum Value: 127.0 deg C
Minimum Value: -127.0 deg C
Resolution: 1.000 deg C
Tolerance: Unknown
Accuracy: Unknown
OEM-specific Information: 0x0000DC03
Nominal Value: 10.0 deg C
Handle 0x1C04, DMI type 28, 22 bytes
Temperature Probe
Description: OTHER
Location: Other
Status: OK
Maximum Value: 127.0 deg C
Minimum Value: -127.0 deg C
Resolution: 1.000 deg C
Tolerance: Unknown
Accuracy: Unknown
OEM-specific Information: 0x0000DC04
Nominal Value: 10.0 deg C
Handle 0x1C05, DMI type 28, 22 bytes
Temperature Probe
Description: SKIN
Location: Motherboard
Status: OK
Maximum Value: 127.0 deg C
Minimum Value: -127.0 deg C
Resolution: 1.000 deg C
Tolerance: Unknown
Accuracy: Unknown
OEM-specific Information: 0x0000DC05
Nominal Value: 10.0 deg C
Handle 0x2000, DMI type 32, 11 bytes
System Boot Information
Status: No errors detected
Handle 0x2700, DMI type 39, 22 bytes
System Power Supply
Power Unit Group: 1
Location:
Name:
Manufacturer:
Serial Number:
Asset Tag:
Model Part Number:
Revision:
Max Power Capacity: Unknown
Status: Present, Unknown
Type: Unknown
Input Voltage Range Switching: Unknown
Plugged: Yes
Hot Replaceable: No
Input Voltage Probe Handle: 0x0000
Cooling Device Handle: 0x000A
Input Current Probe Handle: 0x0000
Handle 0x2900, DMI type 41, 11 bytes
Onboard Device
Reference Designation:
Type: Video
Status: Enabled
Type Instance: 0
Bus Address: 0000:00:02.0
Handle 0x2901, DMI type 41, 11 bytes
Onboard Device
Reference Designation:
Type: Ethernet
Status: Disabled
Type Instance: 0
Bus Address: 0000:00:1f.6
Handle 0x2902, DMI type 41, 11 bytes
Onboard Device
Reference Designation:
Type: Sound
Status: Disabled
Type Instance: 0
Bus Address: 0000:00:1f.3
Handle 0x2903, DMI type 41, 11 bytes
Onboard Device
Reference Designation:
Type: SATA Controller
Status: Disabled
Type Instance: 0
Bus Address: 0000:00:17.0
Handle 0x2B00, DMI type 43, 31 bytes
TPM Device
Vendor ID: STM
Specification Version: 2.0
Firmware Revision: 1.769
Description: TPM 2.0, ManufacturerID: STM , Firmware Version: 0x00010301.0x0
Characteristics:
TPM Device characteristics not supported
OEM-specific Information: 0x00000000
Handle 0x8200, DMI type 130, 24 bytes
OEM-specific Type
Header and Data:
82 18 00 82 24 41 4D 54 00 00 00 00 00 A5 EF 02
80 00 00 00 00 00 00 00
Handle 0x8300, DMI type 131, 64 bytes
OEM-specific Type
Header and Data:
83 40 00 83 35 00 00 00 00 00 00 00 00 00 00 00
F8 00 82 51 00 00 00 00 21 20 00 00 01 00 10 00
38 0B 2A 00 00 00 00 00 FE 00 FF FF 00 00 00 00
00 00 00 00 26 00 00 00 76 50 72 6F 00 00 00 00
Handle 0x8500, DMI type 133, 44 bytes
OEM-specific Type
Header and Data:
85 2C 00 85 F9 B4 95 78 4D 92 0A 41 96 39 12 38
62 B2 8A 63 00 86 80 08 16 12 20 26 12 86 80 01
00 00 00 61 72 57 18 03 00 00 00 00
Handle 0x8800, DMI type 136, 8 bytes
OEM-specific Type
Header and Data:
88 08 00 88 00 00 00 00
Handle 0xB100, DMI type 177, 12 bytes
OEM-specific Type
Header and Data:
B1 0C 00 B1 1E 00 00 00 00 00 00 00
Handle 0xB200, DMI type 178, 88 bytes
OEM-specific Type
Header and Data:
B2 58 00 B2 0A 01 12 00 3B 00 0B 00 3C 00 0A 00
3D 00 0C 00 3F 00 16 00 40 00 13 00 41 00 14 00
42 00 18 00 48 00 FF FF 50 00 FF FF 10 00 FF 00
11 00 FF 00 12 00 FF 00 13 00 FF 00 14 00 FF 00
1E 00 FF 00 1F 00 FF 00 20 00 FF 00 21 00 FF 00
22 00 FF 00 50 01 26 00
Strings:
Handle 0xB300, DMI type 179, 5 bytes
OEM-specific Type
Header and Data:
B3 05 00 B3 01
Strings:
1[1E5B396F5FC0F69F5980AEFD516FE0D7B0FAABEFD87935E13D7E70A88209358E]
Handle 0xCB00, DMI type 203, 106 bytes
OEM-specific Type
Header and Data:
CB 6A 00 CB 01 04 01 45 02 00 A4 06 01 85 39 20
00 00 00 00 40 00 00 03 1F 04 00 CB 03 E0 C7 02
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
FF FF FF FF FF FF FF FF 03 00 00 00 80 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00
Strings:
MEI1
MEI2
MEI3
MEI4
Handle 0xCD00, DMI type 205, 12 bytes
OEM-specific Type
Header and Data:
CD 0C 00 CD 01 01 00 02 00 00 5D 01
Strings:
BIOS Guard
Handle 0xCD01, DMI type 205, 12 bytes
OEM-specific Type
Header and Data:
CD 0C 01 CD 01 01 00 04 00 00 00 00
Strings:
FSP Binary Version
Handle 0xCD02, DMI type 205, 26 bytes
OEM-specific Type
Header and Data:
CD 1A 02 CD 03 01 00 0C 00 71 76 00 02 00 00 00
04 3B 00 03 00 01 12 0C 00 00
Strings:
Reference Code - CPU
uCode Version
TXT ACM version
Handle 0xCD03, DMI type 205, 26 bytes
OEM-specific Type
Header and Data:
CD 1A 03 CD 03 01 00 0C 00 71 76 00 02 00 10 00
00 02 00 03 04 10 01 2A 38 0B
Strings:
Reference Code - ME
MEBx version
ME Firmware Version
Consumer SKU
Handle 0xCD04, DMI type 205, 47 bytes
OEM-specific Type
Header and Data:
CD 2F 04 CD 06 01 00 0C 00 71 76 00 02 03 FF FF
FF FF FF 04 00 FF FF FF 01 00 05 00 FF FF FF 01
00 06 00 02 46 00 00 00 07 00 04 00 00 00 00
Strings:
Reference Code - PCH
PCH-CRID Status
Disabled
PCH-CRID Original Value
PCH-CRID New Value
OPROM - RST - RAID
PCH Hsio Version
Handle 0xCD05, DMI type 205, 82 bytes
OEM-specific Type
Header and Data:
CD 52 05 CD 0B 01 00 0C 00 71 76 00 02 00 00 00
04 24 00 03 00 0C 00 71 76 00 04 05 FF FF FF FF
FF 06 00 00 00 00 02 00 07 00 00 00 00 02 00 08
00 FF FF FF FF FF 09 00 24 00 07 00 00 0A 00 00
00 00 00 00 0B 00 00 00 00 00 00 0C 00 FF FF FF
FF FF
Strings:
Reference Code - SA - System Agent
Reference Code - MRC
SA - PCIe Version
SA-CRID Status
Disabled
SA-CRID Original Value
SA-CRID New Value
OPROM - VBIOS
IO Manageability Engine FW Version
PHY Build Version
Thunderbolt(TM) FW Version
System Agent Manageability Engine FW Version
Handle 0xCD06, DMI type 205, 82 bytes
OEM-specific Type
Header and Data:
CD 52 06 CD 0B 01 00 FF FF FF FF FF 02 00 FF FF
FF FF FF 03 04 FF FF FF FF FF 05 06 FF FF FF FF
FF 07 08 FF FF FF FF FF 09 00 FF FF FF FF FF 0A
00 FF FF FF FF FF 0B 00 01 07 00 00 00 0C 00 00
21 00 47 10 0D 00 FF FF FF FF FF 0E 00 00 07 00
00 00
Strings:
Lan Phy Version
Sensor Firmware Version
Debug Mode Status
Disabled
Performance Mode Status
Disabled
Debug Use USB(Disabled:Serial)
Disabled
ICC Overclocking Version
UNDI Version
EC FW Version
GOP Version
Royal Park Version
Platform Version
Handle 0xD000, DMI type 208, 16 bytes
OEM-specific Type
Header and Data:
D0 10 00 D0 03 11 FE 00 FF 0A 01 02 00 00 00 00
Strings:
20230213
20230224
Handle 0xD800, DMI type 216, 9 bytes
OEM-specific Type
Header and Data:
D8 09 00 D8 01 02 01 88 00
Strings:
"Intel Corp."
"2089"
Handle 0xD900, DMI type 217, 8 bytes
OEM-specific Type
Header and Data:
D9 08 00 D9 01 02 01 03
Strings:
US-101
Proprietary
Handle 0xDC00, DMI type 220, 22 bytes
OEM-specific Type
Header and Data:
DC 16 00 DC 00 F1 00 00 02 F1 00 00 00 00 00 00
00 00 00 00 00 00
Handle 0xDC01, DMI type 220, 22 bytes
OEM-specific Type
Header and Data:
DC 16 01 DC 10 F1 00 00 12 F1 00 00 00 00 00 00
00 00 00 00 00 00
Handle 0xDC02, DMI type 220, 22 bytes
OEM-specific Type
Header and Data:
DC 16 02 DC 20 F1 00 00 22 F1 00 00 00 00 00 00
00 00 00 00 00 00
Handle 0xDC03, DMI type 220, 22 bytes
OEM-specific Type
Header and Data:
DC 16 03 DC 30 F1 00 00 32 F1 00 00 00 00 00 00
00 00 00 00 00 00
Handle 0xDC04, DMI type 220, 22 bytes
OEM-specific Type
Header and Data:
DC 16 04 DC 40 F1 00 00 42 F1 00 00 00 00 00 00
00 00 00 00 00 00
Handle 0xDC05, DMI type 220, 22 bytes
OEM-specific Type
Header and Data:
DC 16 05 DC 50 F1 00 00 52 F1 00 00 00 00 00 00
00 00 00 00 00 00
Handle 0xDD00, DMI type 221, 19 bytes
OEM-specific Type
Header and Data:
DD 13 00 DD 03 01 00 00 F6 01 F6 00 00 00 00 00
00 00 00
Handle 0xDD01, DMI type 221, 19 bytes
OEM-specific Type
Header and Data:
DD 13 01 DD 03 01 00 10 F6 11 F6 00 00 00 00 00
00 00 00
Handle 0xDE00, DMI type 222, 16 bytes
OEM-specific Type
Header and Data:
DE 10 00 DE 01 04 00 00 26 08 29 13 38 01 00 00
Handle 0xFEFF, DMI type 127, 4 bytes
End Of Table
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [BUG] i2c: acpi: Dell XPS 17 9720 ELAN 04F3:311C touchpad (VEN_04F3) needs 100 kHz like DLL0945
2026-11-09 20:57 ` penhouse24
@ 2026-11-11 7:59 ` Mika Westerberg
2026-11-12 2:18 ` penhouse24
0 siblings, 1 reply; 4+ messages in thread
From: Mika Westerberg @ 2026-11-11 7:59 UTC (permalink / raw)
To: penhouse24
Cc: westeri@kernel.org, andi.shyti@kernel.org,
linux-i2c@vger.kernel.org, linux-acpi@vger.kernel.org
Hi,
On Mon, Nov 09, 2026 at 08:57:13PM +0000, penhouse24@proton.me wrote:
> Hi Mika,
>
> Thank you for the response (I honestly wasn't expecting anyone to respond for this niche issue---so a welcome surprise).
>
> Yes my BIOS version (v1.41.0) is up to date. Currently, there are no updates available through Windows or from fwupd. I have received BIOS updates many times via Windows since purchasing this computer in 2022 and have had 0 change to this problem.
>
> For what it’s worth, the DSDT has a valid default ID. TPD0 starts with Name (ITPN, “DELL0AFF”), and _INI then overwrites it from the BIOS-provided TPHD variable, which yields “VEN_04F3”.
>
> Please find attached the output of 'sudo dmidecode'.
>
> Thank you for helping me fix this.
Can you try the below patch?
diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c
index 84841ed13487..bed9260056b3 100644
--- a/drivers/i2c/i2c-core-acpi.c
+++ b/drivers/i2c/i2c-core-acpi.c
@@ -7,6 +7,7 @@
#include <linux/acpi.h>
#include <linux/device.h>
+#include <linux/dmi.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/list.h>
@@ -356,6 +357,17 @@ static const struct acpi_device_id i2c_acpi_force_400khz_device_ids[] = {
{ }
};
+static const struct dmi_system_id i2c_acpi_dell_xps_17_9720_dmi_ids[] = {
+ {
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "XPS 17 9720"),
+ DMI_MATCH(DMI_BIOS_VERSION, "1.41.0"),
+ },
+ },
+ { }
+};
+
static const struct acpi_device_id i2c_acpi_force_100khz_device_ids[] = {
/*
* When a 400KHz freq is used on this model of ELAN touchpad in Linux,
@@ -377,6 +389,14 @@ static const struct acpi_device_id i2c_acpi_force_100khz_device_ids[] = {
{ .id = "ELAN0678" },
{ .id = "ELAN06FA" },
{ .id = "ELAN1300" },
+ {
+ /*
+ * Some Dell XPS 17 9720 is not using standard ACPI IDs
+ * so we need to match also via DMI strings.
+ */
+ .id = "VEN_04F3",
+ .driver_data = (kernel_ulong_t)i2c_acpi_dell_xps_17_9720_dmi_ids,
+ },
{ }
};
@@ -385,6 +405,7 @@ static acpi_status i2c_acpi_lookup_speed(acpi_handle handle, u32 level,
{
struct i2c_acpi_lookup *lookup = data;
struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
+ const struct acpi_device_id *id;
if (!adev || i2c_acpi_do_lookup(adev, lookup))
return AE_OK;
@@ -398,7 +419,9 @@ static acpi_status i2c_acpi_lookup_speed(acpi_handle handle, u32 level,
if (acpi_match_device_ids(adev, i2c_acpi_force_400khz_device_ids) == 0)
lookup->force_speed = I2C_MAX_FAST_MODE_FREQ;
- if (acpi_match_device_ids(adev, i2c_acpi_force_100khz_device_ids) == 0)
+ id = acpi_match_acpi_device(i2c_acpi_force_100khz_device_ids, adev);
+ if (id && (!id->driver_data ||
+ dmi_check_system((const struct dmi_system_id *)id->driver_data)))
lookup->force_speed = I2C_MAX_STANDARD_MODE_FREQ;
return AE_OK;
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [BUG] i2c: acpi: Dell XPS 17 9720 ELAN 04F3:311C touchpad (VEN_04F3) needs 100 kHz like DLL0945
2026-11-11 7:59 ` Mika Westerberg
@ 2026-11-12 2:18 ` penhouse24
0 siblings, 0 replies; 4+ messages in thread
From: penhouse24 @ 2026-11-12 2:18 UTC (permalink / raw)
To: Mika Westerberg
Cc: westeri@kernel.org, andi.shyti@kernel.org,
linux-i2c@vger.kernel.org, linux-acpi@vger.kernel.org
Hi Mika,
Tested on top of v7.4-rc2 (067c5c24cef2) on a Dell XPS 17 9720, BIOS 1.41.0, without the SSDT override.
The quirk is applied at boot.
I've been using my laptop all day and the touchpad lag has not come back so far including on AC power. On the unpatched kernel it returns as before.
Interestingly enough, I did use an off-brand AC charger for my laptop and the touchpad lag returned on the patched and unpatched Linux kernels AND Windows. When I used the Dell AC charger, the lag was gone on the patched kernel and Windows, but remained on the unpatched kernel. Perhaps the root cause of this problem, on Linux relative to Windows is that Windows aggressively filters noise without smoothing? Not sure, just a thought
One question about the DMI match: does it need DMI_BIOS_VERSION? The VEN_04F3 ID check already makes the quirk stop applying if a future BIOS switches to a proper ACPI ID. The 400 kHz problem also seems to be in the touchpad itself, since the same 04F3:311C part is affected on the Precision 5560. Matching only on sys_vendor and product_name would also cover users on older BIOS versions, and any newer BIOS that still reports VEN_04F3.
Dell also ships the same BIOS image for the Precision 5770, so it likely exposes the same ID, though I can't test that model.
Thanks for the quick patch!
On Wednesday, November 11th, 2026 at 2:59 AM, Mika Westerberg <mika.westerberg@linux.intel.com> wrote:
> Hi,
>
> On Mon, Nov 09, 2026 at 08:57:13PM +0000, penhouse24@proton.me wrote:
> > Hi Mika,
> >
> > Thank you for the response (I honestly wasn't expecting anyone to respond for this niche issue---so a welcome surprise).
> >
> > Yes my BIOS version (v1.41.0) is up to date. Currently, there are no updates available through Windows or from fwupd. I have received BIOS updates many times via Windows since purchasing this computer in 2022 and have had 0 change to this problem.
> >
> > For what it’s worth, the DSDT has a valid default ID. TPD0 starts with Name (ITPN, “DELL0AFF”), and _INI then overwrites it from the BIOS-provided TPHD variable, which yields “VEN_04F3”.
> >
> > Please find attached the output of 'sudo dmidecode'.
> >
> > Thank you for helping me fix this.
>
> Can you try the below patch?
>
> diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c
> index 84841ed13487..bed9260056b3 100644
> --- a/drivers/i2c/i2c-core-acpi.c
> +++ b/drivers/i2c/i2c-core-acpi.c
> @@ -7,6 +7,7 @@
>
> #include <linux/acpi.h>
> #include <linux/device.h>
> +#include <linux/dmi.h>
> #include <linux/err.h>
> #include <linux/i2c.h>
> #include <linux/list.h>
> @@ -356,6 +357,17 @@ static const struct acpi_device_id i2c_acpi_force_400khz_device_ids[] = {
> { }
> };
>
> +static const struct dmi_system_id i2c_acpi_dell_xps_17_9720_dmi_ids[] = {
> + {
> + .matches = {
> + DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
> + DMI_MATCH(DMI_PRODUCT_NAME, "XPS 17 9720"),
> + DMI_MATCH(DMI_BIOS_VERSION, "1.41.0"),
> + },
> + },
> + { }
> +};
> +
> static const struct acpi_device_id i2c_acpi_force_100khz_device_ids[] = {
> /*
> * When a 400KHz freq is used on this model of ELAN touchpad in Linux,
> @@ -377,6 +389,14 @@ static const struct acpi_device_id i2c_acpi_force_100khz_device_ids[] = {
> { .id = "ELAN0678" },
> { .id = "ELAN06FA" },
> { .id = "ELAN1300" },
> + {
> + /*
> + * Some Dell XPS 17 9720 is not using standard ACPI IDs
> + * so we need to match also via DMI strings.
> + */
> + .id = "VEN_04F3",
> + .driver_data = (kernel_ulong_t)i2c_acpi_dell_xps_17_9720_dmi_ids,
> + },
> { }
> };
>
> @@ -385,6 +405,7 @@ static acpi_status i2c_acpi_lookup_speed(acpi_handle handle, u32 level,
> {
> struct i2c_acpi_lookup *lookup = data;
> struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
> + const struct acpi_device_id *id;
>
> if (!adev || i2c_acpi_do_lookup(adev, lookup))
> return AE_OK;
> @@ -398,7 +419,9 @@ static acpi_status i2c_acpi_lookup_speed(acpi_handle handle, u32 level,
> if (acpi_match_device_ids(adev, i2c_acpi_force_400khz_device_ids) == 0)
> lookup->force_speed = I2C_MAX_FAST_MODE_FREQ;
>
> - if (acpi_match_device_ids(adev, i2c_acpi_force_100khz_device_ids) == 0)
> + id = acpi_match_acpi_device(i2c_acpi_force_100khz_device_ids, adev);
> + if (id && (!id->driver_data ||
> + dmi_check_system((const struct dmi_system_id *)id->driver_data)))
> lookup->force_speed = I2C_MAX_STANDARD_MODE_FREQ;
>
> return AE_OK;
>
^ permalink raw reply [flat|nested] 4+ messages in thread
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2026-11-09 10:45 ` [BUG] i2c: acpi: Dell XPS 17 9720 ELAN 04F3:311C touchpad (VEN_04F3) needs 100 kHz like DLL0945 Mika Westerberg
2026-11-09 20:57 ` penhouse24
2026-11-11 7:59 ` Mika Westerberg
2026-11-12 2:18 ` penhouse24
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