From: Takashi Iwai <tiwai@suse.de>
To: "Pali Rohár" <pali@kernel.org>,
"Dmitry Torokhov" <dmitry.torokhov@gmail.com>
Cc: regressions@lists.linux.dev, linux-input@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [REGRESSION] wrong coord from Thinkpad TrackPoint since 6.2 kernel
Date: Wed, 29 Mar 2023 10:16:43 +0200 [thread overview]
Message-ID: <87h6u4otuc.wl-tiwai@suse.de> (raw)
Hi,
we've received a bug report about Thinkpad TrackPoint (ALPS DualPoint
Stick) on 6.2 kernel:
https://bugzilla.opensuse.org/show_bug.cgi?id=1209805
The device reports the wrong values as the movements, e.g. sometimes a
value such as 255, 254 or -255 is returned while usually it should be
a smaller value like -1 or 2.
The evtest on 6.2.x kernel shows the wrong values like:
Event: time 1680037542.898747, type 2 (EV_REL), code 0 (REL_X), value 255
Event: time 1680037542.898747, -------------- SYN_REPORT ------------
Event: time 1680037543.145196, type 2 (EV_REL), code 0 (REL_X), value 1
Event: time 1680037543.145196, -------------- SYN_REPORT ------------
Event: time 1680037543.175087, type 2 (EV_REL), code 1 (REL_Y), value -255
Event: time 1680037543.175087, -------------- SYN_REPORT ------------
Event: time 1680037543.185421, type 2 (EV_REL), code 0 (REL_X), value 1
Event: time 1680037543.185421, type 2 (EV_REL), code 1 (REL_Y), value -255
Event: time 1680037543.185421, -------------- SYN_REPORT ------------
while 6.1.x kernel shows the correct values like:
Event: time 1680037386.318058, type 2 (EV_REL), code 0 (REL_X), value -1
Event: time 1680037386.318058, type 2 (EV_REL), code 1 (REL_Y), value -1
Event: time 1680037386.318058, -------------- SYN_REPORT ------------
Event: time 1680037386.328087, type 2 (EV_REL), code 0 (REL_X), value -1
Event: time 1680037386.328087, type 2 (EV_REL), code 1 (REL_Y), value -1
Event: time 1680037386.328087, -------------- SYN_REPORT ------------
Event: time 1680037386.338046, type 2 (EV_REL), code 0 (REL_X), value -1
Event: time 1680037386.338046, type 2 (EV_REL), code 1 (REL_Y), value -2
Event: time 1680037386.338046, -------------- SYN_REPORT ------------
I couldn't see any relevant changes in alps.c between those versions,
so this is likely a breakage in a lower layer.
Could you guys take a look?
Thanks!
Takashi
next reply other threads:[~2023-03-29 8:18 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-29 8:16 Takashi Iwai [this message]
2023-03-29 9:22 ` [REGRESSION] wrong coord from Thinkpad TrackPoint since 6.2 kernel Hans de Goede
2023-03-29 9:28 ` Takashi Iwai
2023-03-30 8:23 ` Takashi Iwai
2023-04-01 21:17 ` Dmitry Torokhov
2023-03-31 13:38 ` Linux regression tracking (Thorsten Leemhuis)
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