linux-kernel - Re: Requesting your attention and expertise regarding a Tablet/Kernel issue

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Message-ID: <CAO-hwJLinACPsk=mEHrEz_YJroknmm=9PcX8byHiqEDxqOConQ@mail.gmail.com>
Date:   Fri, 24 Nov 2023 18:18:31 +0100
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     David Revoy <davidrevoy@...tonmail.com>
Cc:     José Expósito <jose.exposito89@...il.com>,
        Eric GOUYER <folays@...il.com>,
        Illia Ostapyshyn <ostapyshyn@....uni-hannover.de>,
        jkosina@...e.cz, jason.gerecke@...om.com,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Requesting your attention and expertise regarding a Tablet/Kernel issue

Hi David,

On Thu, Nov 23, 2023 at 11:12 PM David Revoy <davidrevoy@...tonmail.com> wrote:
>
> Hi Benjamin,
>
> Sorry for late reply.
>
> > So it would be nice if you could try the artifacts of job 51600738[4].
> > Again, download them (udev-hid-bpf_0.1.0-4-g5ab02ec.tar.xz), unpack,
> > sudo ./install --verbose, then unplug/replug the artist Pro 24.
>
> Ok, the main change I experienced after installing is xsetwacom
> listing the ID name of the device with twice the name Stylus on
> "UGTABLET 24 inch PenDisplay Stylus stylus". Before it was only
> "UGTABLET 24 inch PenDisplay stylus".
>
> $ xsetwacom --list
> UGTABLET 24 inch PenDisplay Stylus stylus       id: 10  type: STYLUS
>
> Not a big deal, but I thought it was worth to mention it.

Oh, this might be because I added a debug device. Given that there are
2 devices on the HID node, then one is tagged as Stylus by the kernel.
Nothing to worry about.

>
> > Then, I'll need the following sequence (ideally repeated twice or
> > three times, given that your last record show a slight difference in
> > the first and second attempt):
> >
> > - outside of the proximity of the sensor, press the upper button
> > - approach the stylus to the surface keeping the upper button pressed
> > - touch the surface with the tip while holding the upper button pressed
> > - release the upper button while keeping the tip pressed (like previously)
> > - press once again the upper button while keeping the tip touching the
> > surface (like previously)
> > - lift of the pen, keeping the upper button pressed, and still in
> > range of the sensor
> > - remove the pen from the proximity of the sensor entirely (move away
> > 20 cm or so), while still keeping the upper button pressed
> >
> > It's actually longer to describe than to execute :)
> >
>
> Thank you for the detailed steps. True, it makes sens once
> practising it. I made the gesture three time on:
>
> https://www.peppercarrot.com/extras/mailing-list/hid-records/XPPEN-Artist-24-Pro/2023-11-23_XPPEN-Artist-24-Pro_pen_tip-contact-and-press-release-upper-stylus-button-while-pressed-x3.txt

Thanks a lot. And of course this device doesn't react in the way I expected :)

Transitions from/to the tip touching the surface while the second
button is pressed are normal, there are no extra events...

But this also showed that the previous filter was better when pressing
the upper button while touching the tip on the surface, because now we
get another spurious event that was filtered before (and because it
was filtered, I thought it was not there).

Anyway, I couldn't rewrite the filter today, but I'll work on it next
week for sure.

>
> > But I would also totally understand that you had enough debugging and
> > you would rather focus on using the tablets, instead of debugging
> > them. In which case, someone else from the community might help me.
>
> No problem for continue testing, I'm around! Thank you again
> for improving the behavior of the tablets.
>

great!

Cheers,
Benjamin


> Cheers,
> David
>