linux-kernel - [REGRESSION][BISECTED] YOGA 7 pencil only show up as eraser since 9c2913b962da

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Message-ID: <3cd82004-c5b8-4f2a-9a3b-d88d855c65e4@heusel.eu>
Date: Tue, 8 Oct 2024 12:19:48 +0200
From: Christian Heusel <christian@...sel.eu>
To: Tatsunosuke Tobita <tatsunosuke.tobita@...om.com>, 
	Ping Cheng <ping.cheng@...om.com>, Benjamin Tissoires <bentiss@...nel.org>
Cc: regressions@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	Daniel Jutz <daniel@...tz.com>, Jason Gerecke <jason.gerecke@...om.com>, 
	linux-input@...r.kernel.org
Subject: [REGRESSION][BISECTED] YOGA 7 pencil only show up as eraser since
 9c2913b962da

Hello everyone,

Daniel (in CC) as well as the Arch forum user "ls" report a regression
with the pen of their Yoga 7 2-in-1 14AHP9 Laptop that leads to it being
always recognized as an eraser:

    $ libinput debug-tablet
    Tool: eraser serial 0x80e51447, id 0x219

    $ evtest /dev/input/event6
    type 1 (EV_KEY), code 321 (BTN_TOOL_RUBBER), value 0

While the expected output with a previous kernel version (6.10.y stable
series) is the following:

    $ libinput debug-tablet
    Tool: pen serial 0x80e51447, id 0x219

    $ evtest /dev/input/event6
    type 1 (EV_KEY), code 320 (BTN_TOOL_PEN), value 0

We have bisected the issue together in the mainline tree and found that
the following commit has introduced this behaviour:

    9c2913b962da ("HID: wacom: more appropriate tool type categorization")

If any more debug information is needed or there are preliminary patches
to test we're happy to help!
If there is a fix found for this issue it would be nice if you could
credit us as follows:

Reported-by: Daniel Jutz <daniel@...tz.com>
Bisected-by: Christian Heusel <christian@...sel.eu>

Cheers,
Chris

---

#regzbot link: https://bbs.archlinux.org/viewtopic.php?id=300005
#regzbot introduced: 9c2913b962da
#regzbot title: HID/wacom: Yoga 7 Pen always detected as eraser

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