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Date:   Sun, 19 Mar 2023 17:51:57 +0100
From:   Pali Rohár <pali@...nel.org>
To:     Thorsten Leemhuis <regressions@...mhuis.info>
Cc:     Steffen <wiesenbergsteffen+lxkernel@...il.com>,
        Linux kernel regressions list <regressions@...ts.linux.dev>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        "open list:HID CORE LAYER" <linux-input@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, lanelone@...il.com
Subject: Re: [regression] Bug 217182 - Dell Latitude E7450 Trackpoint not
 working as expected

On Wednesday 15 March 2023 10:50:46 Thorsten Leemhuis wrote:
> On 13.03.23 11:20, Linux regression tracking (Thorsten Leemhuis) wrote:
> > 
> > Hi, Thorsten here, the Linux kernel's regression tracker.
> > 
> > I noticed a regression report in bugzilla.kernel.org. As many (most?)
> > kernel developer don't keep an eye on it, I decided to forward it by
> > mail. Quoting from https://bugzilla.kernel.org/show_bug.cgi?id=217182 :
> > 
> >>  Steffen 2023-03-12 11:17:02 UTC
> >>
> >> Hi,
> >> I'm new to this bug tracking system and just a user, not a developer.
> >>
> >> I use a Dell Latitude E7450 running with the Debian unstable based
> >> distribution Siduction.
> >> After upgrading to Linux kernel 6.2.x the Trackpoint does not work
> >> anymore as expected. It uses an Alps PS/2 DualPoint Stick.
> >> Even slight touches in any direction send the cursor to the top right
> >> corner of the screen where it stays regardless of actual pointer
> >> movement. This also appears in console mode. One can retrieve the
> >> pointer again with the touchpad, but I'm more precise with the
> >> Trackpoint and prefer using that.
> >> The Trackpoint works well in kernel 6.1.14
> >> Can somebody help?
> > 
> > See the ticket for more details.
> 
> FWIW, another user reported seeing the same problem on a different machine:
> 
> ```
>  Radek 2023-03-14 08:00:31 UTC
> 
> I am experiencing the same issue with kernel >6.2.x on Toshiba Z30
> with Alps PS/2 DualPoint trackpoint / touchpad. The cursor jumps top
> right even with the lowest sensitivity settings. It works just fine
> with 6.1 or lower.
> ```
> 
> Pali, or anybody else: anyone any idea what's might be wrong there?
> There afaics is only one recent commit to the alps driver (292a089d78d3
> ("treewide: Convert del_timer*() to timer_shutdown*()")); it it maybe
> worth trying to revert it?
> 
> Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
> --
> Everything you wanna know about Linux kernel regression tracking:
> https://linux-regtracking.leemhuis.info/about/#tldr
> If I did something stupid, please tell me, as explained on that page.

Could you try following patch?
https://lore.kernel.org/linux-input/20230318144206.14309-1-msizanoen@qtmlabs.xyz/

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