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Bug#989285: linux-image-5.10.0-6-amd64: Elantech trackpoint loses sync and jumps to the corner/edge of the screen

From	Jörg Kastning <joerg.kastning@gmail.com>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#989285: linux-image-5.10.0-6-amd64: Elantech trackpoint loses sync and jumps to the corner/edge of the screen
Date	2021-06-01 10:20 +0200
Message-ID	<Cl7MZ-5ya-3@gated-at.bofh.it> (permalink)
References	<CkKGJ-8v9-1@gated-at.bofh.it> <CkLCO-BQ-3@gated-at.bofh.it> <Cl5Lc-4pl-3@gated-at.bofh.it> <CkKGJ-8v9-1@gated-at.bofh.it> <Cl5Lc-4pl-3@gated-at.bofh.it>
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Cross-posted to 2 groups.

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On 01.06.21 08:02, Salvatore Bonaccorso wrote:
> Would you be able to confirm that the patch provided by Oleg,
> referenced solves the issue for you?
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=1964036#c1

Hi,

Unfortunately I cannot confirm that. Because the patch doesn't seem to 
cover all cases of jumps. Please see the following comment for reference.

https://bugzilla.redhat.com/show_bug.cgi?id=1964036#c5

So I still see jumps when running a patched kernel. Though I'm under the 
impression there are fewer jumps than without the patch.

Please be aware that I don't have any sophisticated test procedure. I'm 
just using the TrackPoint during my work on different tasks and don't 
have any reproducible test pattern, yet.

> 
> https://kernel-team.pages.debian.net/kernel-handbook/ch-common-tasks.html#s4.2.2
> 

I could run an unpatched kernel for an hour and count the jumps. Then 
run the patched version and count the jumps to see if there is 
significant difference. Would that help to decide whether it's worth to 
include the patch as a workaround or not?

Regards,
Joerg

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Bug#989285: linux-image-5.10.0-6-amd64: Elantech trackpoint loses sync and jumps to the corner/edge of the screen Joerg <joerg.kastning@gmail.com> - 2021-05-31 09:40 +0200
  Bug#989285: linux-image-5.10.0-6-amd64: Elantech trackpoint loses sync and jumps to the corner/edge of the screen Jörg Kastning <joerg.kastning@gmail.com> - 2021-05-31 10:40 +0200
    Bug#989285: linux-image-5.10.0-6-amd64: Elantech trackpoint loses sync and jumps to the corner/edge of the screen Salvatore Bonaccorso <carnil@debian.org> - 2021-06-01 08:10 +0200
      Bug#989285: linux-image-5.10.0-6-amd64: Elantech trackpoint loses sync and jumps to the corner/edge of the screen Jörg Kastning <joerg.kastning@gmail.com> - 2021-06-01 10:20 +0200

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