Re: [Regression] Bug 216885 - HID++ Logitech G903 generates full scroll wheel events with every hi-res tick when attached via USB

[Linux kernel regression tracking (Thorsten Leemhuis)]

On 30.01.23 11:44, Tobias Klausmann wrote:
> On Mon, 30 Jan 2023, Benjamin Tissoires wrote:
> 
>> On Mon, Jan 30, 2023 at 10:56 AM Linux kernel regression tracking
>> (Thorsten Leemhuis) <regressions@xxxxxxxxxxxxx> wrote:
>>>
>>> [ccing a few people that CCed to the bug]
>>>
>>> Hi, this is your Linux kernel regression tracker.
>>>
>>> On 05.01.23 09:12, Thorsten Leemhuis wrote:
>>>> [...] Quoting from https://bugzilla.kernel.org/show_bug.cgi?id=216885 :
>>>>
>>>>>  David Roth 2023-01-04 20:37:22 UTC
>>>>>
>>>>> Created attachment 303526 [details]
>>>>> Libinput record with G903 attached directly to USB
>>>>>
>>>>> Since
>>>>> https://lore.kernel.org/linux-input/20220914132146.6435-1-hadess@xxxxxxxxxx/T/#u
>>>>> my Logitech G903 has gained hi res support. While normally a good
>>>>> thing, it seems that in this case it leads to generating one normal
>>>>> REL_WHEEL with each REL_WHEEL_HI_RES event instead of just a couple
>>>>> of REL_WHEEL_HI_RES, followed by the standard REL_WHEEL once a
>>>>> notch/tick is reached. This leads to overly sensitive scrolling and
>>>>> makes the wheel basically useless.
>>>
>>> Bastien, Benjamin, Jiri, that problem was reported 25 days ago now and
>>> there is still no fix in sight afaics (please correct me if I'm wrong)
>>> -- and based on the reports I've seen it seem quite a few people are
>>> hitting it. Hence please allow me to ask:
>>>
>>> Wouldn't it be best to revert that change for now (both in mainline and
>>> stable of course) and then reapply it once a fix for this problem is
>>> available? Or
>>
>> Last I heard was that Bastien was actively trying to understand the
>> problem.

Yup, no complains there. Thx for your work on this, Bastien.

But that debugging has already taken some time and it seem more is
needed. And apparently it's more than just a single user or two that is
affected by this. That's why I think it would be better to revert this
temporarily[1], unless a fix suddenly comes into sight.

[1] as strongly suggested by
https://docs.kernel.org/process/handling-regressions.html , which states
that a regression like this should ideally be fixed within a few days
after the report; we are long past this...

>> I do have a G903 here but it is lacking the feature the
>> reporters have, and so I can not reproduce (there is likely a new
>> firmware/model around).
>>
>> After a quick search on
>> https://support.logi.com/hc/en-us/search#q=G903&s=all it seems that
>> there are 2 G903: M-R0081 and M-R0068. I only own the 68 one which
>> explains why I can not reproduce it. :(
> 
> I have an affected mouse and am willing to try patches/fixes, but my
> kernel coding fu is weak. 

Thx for your help, too.

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
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