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

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Message-ID: <nycvar.YFH.7.76.2311012033290.29220@cbobk.fhfr.pm>
Date:   Wed, 1 Nov 2023 20:37:40 +0100 (CET)
From:   Jiri Kosina <jkosina@...e.cz>
To:     David Revoy <davidrevoy@...tonmail.com>
cc:     "jason.gerecke@...om.com" <jason.gerecke@...om.com>,
        "jose.exposito89@...il.com" <jose.exposito89@...il.com>,
        "ilya.ostapyshyn@...il.com" <ilya.ostapyshyn@...il.com>,
        Nils Fuhler <nils@...sfuhler.de>,
        Ping Cheng <ping.cheng@...om.com>,
        Peter Hutterer <peter.hutterer@...-t.net>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: Requesting your attention and expertise regarding a Tablet/Kernel
 issue

On Wed, 1 Nov 2023, David Revoy wrote:

> Hi Jason Gerecke, José Expósito, Jiri Kosina and Illia Ostapyshyn,
> 
> I am emailing to draw your attention and expertise to a problem I had 
> earlier this week with my Xp-Pen Artist 24 Pro display tablet under 
> Fedora Linux 38 KDE after a kernel update.
> 
> The second button on my stylus changed from a right-click (which I could 
> customise with xsetwacom or any GUI like kcm-tablet) to a button that 
> feels 'hardcoded' and now switches the whole device to an eraser mode. 
> This makes my main tool unusable.
> 
> I don't have the skills to write a proper kernel bug report, workaround 
> or even identify the exact source of the issue. I have written a blog 
> post about this with more details here: 
> https://www.davidrevoy.com/article995/how-a-kernel-update-broke-my-stylus-need-help 
> , contacting you was something suggested by the comments.
> 
> Thank you very much if you can help me.

CCing a couple more people involved both in 276e14e6c3 and 87562fcd1342, 
and mailinglists.

This is almost certainly the behavior introduced by 276e14e6c3, where 
previously the button was mapped to BTN_TOUCH, but now it's mapped to 
BTN_TOOL_RUBBER, causing user-visible change in behavior.

-- 
Jiri Kosina
SUSE Labs