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

[Benjamin Tissoires <benjamin.tissoires@redhat.com>]

On Mon, Jan 30, 2023 at 10:56 AM Linux kernel regression tracking
(Thorsten Leemhuis) <regressions@leemhuis.info> 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@hadess.net/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. 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. :(

Cheers,
Benjamin


>
> Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
> --
> Everything you wanna know about Linux kernel regression tracking:
> https://linux-regtracking.leemhuis.info/about/#tldr
> If I did something stupid, please tell me, as explained on that page.
>
> >> Interestingly this only happens when the mouse is connected directly via
> >> cable (PID:0xC091) and not via the Lightspeed wireless dongle
> >> (PID:0x4087) where it will lead to correctly applying the times 8
> >> multiplier and the relevant set of HI_RES and REL_WHEEL event once a
> >> notch is reached.
> >>
> >> I originally thought about patching the module/adding a param to simple
> >> disable high res support in general, assuming this might be something
> >> people might want to configure, but seeing that this can be "fixed" that
> >> way I decided to hold off on the thought.
> >>
> >> However it seems like we'd need to trade one set of quirks for another,
> >> so not sure what the correct approach might be.
> >>
> >> I'll attach some libinput debug logs when the issue happens.
> >
> > See the ticket for more details.
> >
> > BTW, let me use this mail to also add the report to the list of tracked
> > regressions to ensure it's doesn't fall through the cracks:
> >
> > #regzbot introduced: 908d325e1665
> > https://bugzilla.kernel.org/show_bug.cgi?id=216885
> > #regzbot title: hid: overly sensitive scrolling with Logitech G903 that
> > makes the wheel basically useless
> > #regzbot ignore-activity
> >
> > Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
> > --
> > Everything you wanna know about Linux kernel regression tracking:
> > https://linux-regtracking.leemhuis.info/about/#tldr
> > If I did something stupid, please tell me, as explained on that page.
>