linux-kernel - Re: [REGRESSION] Re: ELAN1206 Touchpad Bugzilla 219799

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Message-ID:
 <PN3PR01MB9597F96188E061EB0B7ACBD6B862A@PN3PR01MB9597.INDPRD01.PROD.OUTLOOK.COM>
Date: Mon, 2 Jun 2025 23:37:21 +0530
From: Aditya Garg <gargaditya08@...e.com>
To: agski33 <agski33@...ton.me>,
 "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
 dmaengine@...r.kernel.org,
 Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
 Heiner Kallweit <hkallweit1@...il.com>, Vinod Koul <vkoul@...nel.org>,
 Benjamin Tissoires <bentiss@...nel.org>
Subject: Re: [REGRESSION] Re: ELAN1206 Touchpad Bugzilla 219799



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.
>