ELAN1206 Touchpad Bugzilla 219799

ELAN1206 Touchpad Bugzilla 219799

[agski33]

Hello all,
I am currently experiencing the issue that was previously reported in the following BugZilla entry: https://bugzilla.kernel.org/show_bug.cgi?id=219799.  I noticed that the bug was marked as NEEDINFO so I attempted to fill in the relevant information.


 From my testing, it seems like IDMA transfers relating to the touchpad input are taking too long and causing timeouts within hid-multitouch.  


I contacted ASUS in an attempt to obtain information relating to the workings of the touchpad that may assist with this issue, however I believe it is unlikely that I will be able to obtain anything useful from them.


I am wondering if anyone has any additional suggestions for next debugging steps or things that I may try - would be happy to provide any additional information or do additional debugging etc.


System Details:
Device: ASUS Q528EH with ELAN1206 Touchpad
Kernel versions: 6.9-rc6 is where the issue starts, persists through all kernel versions after including latest.
Symptoms: Touchpad cursor will not move.  
 Additional Observations: Something of potential interest that I noticed was that it appeared the touchpad is sending data byte by byte when doing an IDMA transfer, not sure if that is normal or not.


Any suggestions for next steps are appreciated!  Thank you in advance for your time and input.


Thank you,
Aaron Gdanski

[REGRESSION] Re: ELAN1206 Touchpad Bugzilla 219799

[Aditya Garg]

On 28-05-2025 07:44 pm, agski33 wrote:
> Hello all,
> I am currently experiencing the issue that was previously reported in the following BugZilla entry: https://bugzilla.kernel.org/show_bug.cgi?id=219799.  I noticed that the bug was marked as NEEDINFO so I attempted to fill in the relevant information.
> 
> 
>  From my testing, it seems like IDMA transfers relating to the touchpad input are taking too long and causing timeouts within hid-multitouch.  
> 
> 
> I contacted ASUS in an attempt to obtain information relating to the workings of the touchpad that may assist with this issue, however I believe it is unlikely that I will be able to obtain anything useful from them.
> 
> 
> I am wondering if anyone has any additional suggestions for next debugging steps or things that I may try - would be happy to provide any additional information or do additional debugging etc.
> 
> 
> System Details:
> Device: ASUS Q528EH with ELAN1206 Touchpad
> Kernel versions: 6.9-rc6 is where the issue starts, persists through all kernel versions after including latest.
> Symptoms: Touchpad cursor will not move.  
>  Additional Observations: Something of potential interest that I noticed was that it appeared the touchpad is sending data byte by byte when doing an IDMA transfer, not sure if that is normal or not.
> 
> 
> Any suggestions for next steps are appreciated!  Thank you in advance for your time and input.
> 
> 
> Thank you,
> Aaron Gdanski

Looking at https://bugzilla.kernel.org/show_bug.cgi?id=219799#c2, dd4478d63b6a2b6891fcc1800eb26ce3f1ead1d4
seems to be the patch causing regression.

https://lore.kernel.org/lkml/20240321120453.1360138-1-andriy.shevchenko@linux.intel.com/

Ccing relevant folks here.

Re: [REGRESSION] Re: ELAN1206 Touchpad Bugzilla 219799

[Aditya Garg]

On 02-06-2025 11:35 pm, Aditya Garg wrote:
> 
> 
> On 28-05-2025 07:44 pm, agski33 wrote:
>> Hello all,
>> I am currently experiencing the issue that was previously reported in the following BugZilla entry: https://bugzilla.kernel.org/show_bug.cgi?id=219799.  I noticed that the bug was marked as NEEDINFO so I attempted to fill in the relevant information.
>>
>>
>>  From my testing, it seems like IDMA transfers relating to the touchpad input are taking too long and causing timeouts within hid-multitouch.  
>>
>>
>> I contacted ASUS in an attempt to obtain information relating to the workings of the touchpad that may assist with this issue, however I believe it is unlikely that I will be able to obtain anything useful from them.
>>
>>
>> I am wondering if anyone has any additional suggestions for next debugging steps or things that I may try - would be happy to provide any additional information or do additional debugging etc.
>>
>>
>> System Details:
>> Device: ASUS Q528EH with ELAN1206 Touchpad
>> Kernel versions: 6.9-rc6 is where the issue starts, persists through all kernel versions after including latest.
>> Symptoms: Touchpad cursor will not move.  
>>  Additional Observations: Something of potential interest that I noticed was that it appeared the touchpad is sending data byte by byte when doing an IDMA transfer, not sure if that is normal or not.
>>
>>
>> Any suggestions for next steps are appreciated!  Thank you in advance for your time and input.
>>
>>
>> Thank you,
>> Aaron Gdanski
> 
> Looking at https://bugzilla.kernel.org/show_bug.cgi?id=219799#c2, dd4478d63b6a2b6891fcc1800eb26ce3f1ead1d4
> seems to be the patch causing regression.

My bad, its 9140ce47872bfd89fca888c2f992faa51d20c2bc, the mailing list link is correct though.
> 
> https://lore.kernel.org/lkml/20240321120453.1360138-1-andriy.shevchenko@linux.intel.com/
> 
> Ccing relevant folks here.
> 

Re: [REGRESSION] Re: ELAN1206 Touchpad Bugzilla 219799

[Andy Shevchenko]

On Mon, Jun 02, 2025 at 11:37:21PM +0530, Aditya Garg wrote:
> On 02-06-2025 11:35 pm, Aditya Garg wrote:
> > On 28-05-2025 07:44 pm, agski33 wrote:

...

> >> I am currently experiencing the issue that was previously reported in the
> >> following BugZilla
> >> entry: https://bugzilla.kernel.org/show_bug.cgi?id=219799.  I noticed that
> >> the bug was marked as NEEDINFO so I attempted to fill in the relevant
> >> information.
> >>
> >>  From my testing, it seems like IDMA transfers relating to the touchpad
> >> input are taking too long and causing timeouts within hid-multitouch.  

Is touchpad interface is I²C?

> >> I contacted ASUS in an attempt to obtain information relating to the
> >> workings of the touchpad that may assist with this issue, however I
> >> believe it is unlikely that I will be able to obtain anything useful from
> >> them.
> >>
> >> I am wondering if anyone has any additional suggestions for next debugging
> >> steps or things that I may try - would be happy to provide any additional
> >> information or do additional debugging etc.
> >>
> >> System Details:
> >> Device: ASUS Q528EH with ELAN1206 Touchpad
> >> Kernel versions: 6.9-rc6 is where the issue starts, persists through all
> >> kernel versions after including latest.
> >> Symptoms: Touchpad cursor will not move.  
> >>  Additional Observations: Something of potential interest that I noticed
> >> was that it appeared the touchpad is sending data byte by byte when doing
> >> an IDMA transfer, not sure if that is normal or not.
> >>
> >> Any suggestions for next steps are appreciated!  Thank you in advance for your time and input.
> > 
> > Looking at https://bugzilla.kernel.org/show_bug.cgi?id=219799#c2, dd4478d63b6a2b6891fcc1800eb26ce3f1ead1d4
> > seems to be the patch causing regression.
> 
> My bad, its 9140ce47872bfd89fca888c2f992faa51d20c2bc, the mailing list link is correct though.

It doesn't matter, the patch is technically correct — we do not serve the
spurious (not ours) interrupts.

> > https://lore.kernel.org/lkml/20240321120453.1360138-1-andriy.shevchenko@linux.intel.com/
> > 
> > Ccing relevant folks here.

-- 
With Best Regards,
Andy Shevchenko