Re: Synaptics touchpad not working after suspend, psmouse.synaptics_intertouch

[Matthias <hias@eilert.tech>]

Am 04.05.25 um 08:34 schrieb Aditya Garg:
> Hi Hias

Hi Aditya,

thanks for your patch!

>> On 2 May 2025, at 1:34 AM,arch.hias@eilert.tech wrote:
>>
>> Hi,
>>
>> I'm experiencing an issue with the Synaptics touchpad on my laptop not working after resuming from suspend.
>>
>> This began after upgrading from linux-lts 6.12.19-1 -> 6.12.21-1 [2]
>>
>>
>> Hardware:
>> - Touchpad: SynPS/2 Synaptics TouchPad (PNP: SYN1221 PNP0f13)
>> - Distro: Arch Linux issue began after systemupgrade linux-lts (6.12.19-1 -> 6.12.21-1) (kernel 6.12.24-1-lts)
>>
>> Description:
>> After resuming from suspend, the touchpad is not detected. However, if I suspend and resume a second time, it works again. While checking the logs, I found the following kernel message:
>>
>> kernel: psmouse serio2: synaptics: Your touchpad (PNP: SYN1221 PNP0f13) says it can support a different bus. If i2c-hid and hid-rmi are not used, you might want to try setting psmouse.synaptics_intertouch to 1 and report this tolinux-input@vger.kernel.org.
>>
>> I had previously set `psmouse.synaptics_intertouch=0`, as recommended in the Arch Wiki[1].
>> After changing it to `1`, the touchpad now consistently works after suspend.
>>
>> This setting appears to resolve the issue for my device. I wanted to share this in case it’s helpful for others or worth considering for default handling of this hardware.
>>
>> # libinput list-devices | grep Synaptics -A4
>> Device:                  Synaptics TM3175-002
>> Kernel:                  /dev/input/event13
>> Id:                      <unknown>:06cb:0000
>> Group:                   6
>> Seat:                    seat0, default
>>
>> $ udevadm info /dev/input/event13
>> P: /devices/pci0000:00/0000:00:1f.4/i2c-6/6-002c/rmi4-00/input/input21/event13
>> M: event13
>> R: 13
>> J: c13:77
>> U: input
>> D: c 13:77
>> N: input/event13
>> L: 0
>> S: input/by-path/pci-0000:00:1f.4-event-mouse
>> E: DEVPATH=/devices/pci0000:00/0000:00:1f.4/i2c-6/6-002c/rmi4-00/input/input21/event13
>> E: DEVNAME=/dev/input/event13
>> E: MAJOR=13
>> E: MINOR=77
>> E: SUBSYSTEM=input
>> E: USEC_INITIALIZED=40782030
>> E: ID_INPUT=1
>> E: ID_INPUT_TOUCHPAD=1
>> E: ID_INPUT_WIDTH_MM=81
>> E: ID_INPUT_HEIGHT_MM=39
>> E: ID_BUS=rmi
>> E: ID_SERIAL=noserial
>> E: ID_PATH=pci-0000:00:1f.4
>> E: ID_PATH_TAG=pci-0000_00_1f_4
>> E: ID_INPUT_TOUCHPAD_INTEGRATION=internal
>> E: LIBINPUT_DEVICE_GROUP=1d/6cb/0:rmi4-00
>> E: DEVLINKS=/dev/input/by-path/pci-0000:00:1f.4-event-mouse
>>
>> Links:
>>
>> 1:https://wiki.archlinux.org/title/Touchpad_Synaptics#Touchpad_does_not_work_after_resuming_from_hibernate/suspend
>>
>> 2:http://0x0.st/84b8.txt
>>
>>
>> Let me know if I can provide further Information, logs or tests.
>>
>> Best regards,
>>
>> hias
>>
>>       The ASCII Ribbon Campaign
>> ()     No HTML/RTF in email
>> /\     No Word docs in email
>>      Respect for open standards
> Please test this patch for your device:
To test it, I first removed the kernel command line option 
`psmouse.synaptics_intertouch=1`.

The issue still occurs with the unpatched kernel `linux-lts-6.12.27-1` 
from the Arch Linux repositories [1].

After building and installing the package [1] with your patch applied, 
the touchpad works reliably — even without the 
`psmouse.synaptics_intertouch=1` option.
> —>8—
>
>  From ace747d33f1b9d329309c277879fa8a632606c93 Mon Sep 17 00:00:00 2001
> From: Aditya Garg<gargaditya08@live.com>
> Date: Sun, 4 May 2025 11:46:44 +0530
> Subject: [PATCH] Update synaptics.c
>
> ---
>   drivers/input/mouse/synaptics.c | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
> index 309c360aab5597..24db13ceae3ba2 100644
> --- a/drivers/input/mouse/synaptics.c
> +++ b/drivers/input/mouse/synaptics.c
> @@ -195,6 +195,7 @@ static const char * const smbus_pnp_ids[] = {
>   	"SYN3221", /* HP 15-ay000 */
>   	"SYN323d", /* HP Spectre X360 13-w013dx */
>   	"SYN3257", /* HP Envy 13-ad105ng */
> +	"SYN1221",
>   	NULL
>   };
>   #endif
>
> --------
>
> You can also download the patch from:https://github.com/AdityaGarg8/linux/commit/ace747d33f1b9d329309c277879fa8a632606c93.patch
>
>
> Also, please share you laptops model (Eg: HP Envy 13-ad105ng)

TUXEDO InfinityBook Pro 14 v5 / Barebone N14xCU


This is my first time testing and reporting a kernel patch, so the 
process is new and quite interesting to me. Let me know if I can help 
with further testing or provide additional infos.

> And if you want to be credited for your report, please share your full legal name and email.
Feel free to credit the report as follows:
Name: Matthias Eilert
Email: kernel.hias@eilert.tech


> Thanks
> Aditya

hias

Links:
1:https://gitlab.archlinux.org/archlinux/packaging/packages/linux-lts/-/commit/6b2e8530afda872a3460e7c29cebd302223c1fa8