Re: [6.12.107] MSI G63 9SEK - Synaptics touchpad falls back to PS/2, multitouch lost at boot, fixed by delayed protocol write

[Cameron Spencer <cameron@oscillator.com.au>]

Hi,

Thanks for your swift reply. It appears this is not reproducible in 
mainline:

Tested on 7.3-rc2 and the device probes as SynPS/2 at ~1.9s without 
requiring workaround.

$ dmesg | grep -iE 'psmouse|synaptics|serio|i8042'
[    0.514787] i8042: PNP: PS/2 Controller [PNP0303:PS2K,PNP0f13:PS2M] 
at 0x60,0x64 irq 1,12
[    0.518517] serio: i8042 KBD port at 0x60,0x64 irq 1
[    0.518524] serio: i8042 AUX port at 0x60,0x64 irq 12
[    0.527696] input: AT Translated Set 2 keyboard as 
/devices/platform/i8042/serio0/input/input0
[    1.910459] psmouse serio1: synaptics: queried max coordinates: x 
[..5656], y [..4728]
[    1.939125] psmouse serio1: synaptics: queried min coordinates: x 
[1284..], y [1128..]
[    1.939132] psmouse serio1: synaptics: Your touchpad (PNP: SYN1509 
SYN1500 SYN0002 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 to 
linux-input@vger.kernel.org.
[    1.995171] psmouse serio1: synaptics: Touchpad model: 1, fw: 8.2, 
id: 0x1e2b1, caps: 0xf00323/0x840300/0x26800/0x0, board id: 3163, fw id: 
2286728
[    2.031111] input: SynPS/2 Synaptics TouchPad as 
/devices/platform/i8042/serio1/input/input6




The previous kernel (6.12.101+deb13-amd64) doesn't have this issue either.


Kind regards,

Cameron

On 14/9/26 06:22, Lovekesh Solanki wrote:
> On Sun, Sep 13, 2026 at 05:23:43AM +0000, Cameron Spencer wrote:
>> I experienced an issue where my Synaptics touchpad is registered as a
>> basic PS/2 device at boot, losing all multitouch functionality
>> (two-finger scroll, gestures). Writing "synaptics" to the sysfs protocol
>> file a few seconds after boot restores the SynPS/2 extended protocol and
>> full functionality.
>>
>> System:
>>
>> - Kernel: 6.12.107+deb13-amd64
> Hi,
>
> Thanks for the report, could you see if the issue is reproducible in mainline
> first?
>
>>       $ dmesg | grep -iE 'psmouse|synaptics|serio|i8042'
>>       [    1.006462] i8042: PNP: PS/2 Controller
>> [PNP0303:PS2K,PNP0f13:PS2M] at 0x60,0x64 irq 1,12
>>       [    1.010384] serio: i8042 KBD port at 0x60,0x64 irq 1
>>       [    1.010392] serio: i8042 AUX port at 0x60,0x64 irq 12
>>       [    1.018706] input: AT Translated Set 2 keyboard as
>> /devices/platform/i8042/serio0/input/input0
>>       # psmouse probes at boot, fails the Synaptics handshake, registers
>> as plain "PS/2 Synaptics TouchPad" (no multitouch)
>>       [    2.384949] input: PS/2 Synaptics TouchPad as
>> /devices/platform/i8042/serio1/input/input6
>>       # psmouse-reload service runs after systemd-udev-settle and writes
>> synaptics to /sys/bus/serio/devices/serio1/protocol, then re-probes with
>> the Synaptics extended protocol, queries coordinates, and registers as
>> "SynPS/2 Synaptics TouchPad" (multitouch restored)
>>       [    8.654815] psmouse serio1: synaptics: queried max coordinates:
>> x [..5656], y [..4728]
>>       [    8.683422] psmouse serio1: synaptics: queried min coordinates:
>> x [1284..], y [1128..]
>>       [    8.739382] psmouse serio1: synaptics: Touchpad model: 1, fw:
>> 8.2, id: 0x1e2b1, caps: 0xf00323/0x840300/0x26800/0x0, board id: 3163,
>> fw id: 2286728
>>       [    8.775128] input: SynPS/2 Synaptics TouchPad as
>> /devices/platform/i8042/serio1/input/input21
> Seems like firmware is unable to answer extended queries for some time
> after initialization and just falls back to PS/2,
>
> perhaps we could just add a retry loop around
> synaptics_query_hardware() to give firmware a little extra time.
>
> Thanks,
> Lovekesh