[Wayland-bugs] [Bug 93448] Trackpoint speed lock

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=93448

Peter Hutterer  changed:

   What|Removed |Added

 Resolution|--- |WONTFIX
 Status|NEEDINFO|RESOLVED

--- Comment #24 from Peter Hutterer  ---
I'm going to close this bug now, see comments #19 and #23. There isn't really
much we can do in libinput, sorry.

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[Wayland-bugs] [Bug 93448] Trackpoint speed lock

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=93448

--- Comment #22 from Juraj Fiala  ---
(In reply to Peter Hutterer from comment #21)
> Juraj, can you please try the drift_time and let me know if that fixed it,
> thanks

It didn’t completely fix it (I managed to reproduce it once since then—it was a
bit weird since I had to wait a much longer time for it to fix itself), but it
did make it less often (I can’t say for sure because I thought I set it to 20
permanently but found out I did not). Do you think it would be a good idea for
libinput to set it?

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[Wayland-bugs] [Bug 93448] Trackpoint speed lock

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=93448

Peter Hutterer  changed:

   What|Removed |Added

 Status|REOPENED|NEEDINFO

--- Comment #21 from Peter Hutterer  ---
Juraj, can you please try the drift_time and let me know if that fixed it,
thanks

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[Wayland-bugs] [Bug 93448] Trackpoint speed lock

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=93448

--- Comment #20 from Peter Hutterer  ---
(In reply to Peter Hutterer from comment #19)
> drift_time means if the firmware detects continuous pressure in one
> direction for more than drift_time seconds

after reading up on these details: this isn't in seconds but in units of ~107
ms, so a drift time of 5 is ca 535ms. and in order to trigger the
re-calibration, the x/y deltas have to be small and steady which is why this
particular use-case of slow motion triggers the bug but not others.

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[Wayland-bugs] [Bug 93448] Trackpoint speed lock

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=93448

--- Comment #19 from Peter Hutterer  ---
Judging by your description, what you're seeing is the effect of the
trackpoint's re-calibration.

drift_time means if the firmware detects continuous pressure in one direction
for more than drift_time seconds, it recalibrates this as default neutral
pressure. When you then release, the real hardware-neutral now appears as
movement in the opposite direction -  the trackpoint takes a second or so to
recalibrate itself but that's the pull back you see.

I don't think that's something we can reasonably fix in libinput, it's a way
how trackpoints work and your best option is likely to increase the drift_time
to something quite high so you don't see that effect. Or avoid these types of
movements.

The best we could do in libinput is to have something monitor the trackpoint
coordinates and post a warning in the log when it may trigger but this could a)
cause false positives and b) just be hidden in some log somewhere. So a lot of
code for very little gain.

I think just increasing the drift time is the only real option here, sorry.

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[Wayland-bugs] [Bug 93448] Trackpoint speed lock

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=93448

--- Comment #18 from Juraj Fiala  ---
Created attachment 131668
  --> https://bugs.freedesktop.org/attachment.cgi?id=131668=edit
Saved webpage containing graph

When you open this webpage, you’ll see a temperature graph. When you hover your
mouse above the nodes on it it shows the temperature. Start at the beginning
and continue through the graph while going slow enough to read the
temperatures. You will probably notice that during this time the trackpoint is
hard to control. At the end the trackpoint should have a slight to strong pull
back in the direction of the line.

I can reproduce this on Fedora 25.

❯ cat /sys/devices/platform/i8042/serio1/serio2/drift_time
5

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[Wayland-bugs] [Bug 93448] Trackpoint speed lock

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=93448

Juraj Fiala  changed:

   What|Removed |Added

 Status|RESOLVED|REOPENED
 Resolution|WORKSFORME  |---

--- Comment #17 from Juraj Fiala  ---
It happened again, this time I finally have a way to reproduce it.

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[Wayland-bugs] [Bug 93448] Trackpoint speed lock

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=93448

Peter Hutterer  changed:

   What|Removed |Added

 Resolution|--- |WORKSFORME
 Status|NEEDINFO|RESOLVED

--- Comment #16 from Peter Hutterer  ---
I gather it hasn't reappeared in the last 2 weeks? Closing this bug for now,
please re-open if it happens again.

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[Wayland-bugs] [Bug 93448] Trackpoint speed lock

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=93448

Peter Hutterer  changed:

   What|Removed |Added

 Status|ASSIGNED|NEEDINFO

--- Comment #14 from Peter Hutterer  ---
Juraj, can you confirm that this is the issue you're seeing and that changing
drift_time fixes it?

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[Wayland-bugs] [Bug 93448] Trackpoint speed lock

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=93448

--- Comment #13 from Francis Herne  ---
Similar behaviour can be caused by the auto-calibration feature of the BIOS.

If you hold the trackpoint in a fixed position for a moment (most commonly
while scrolling), it will decide that point is the centre. Releasing the
trackpoint will then cause an uncontrolled movement in the opposite direction
until it recalibrates.

By default, the timeout is 0.5s, which is (IME) rather too low and causes
miscalibrations during normal use.

Try writing to /sys/devices/platform/i8042/serio1/serio2/drift_time (in units
of 0.1s), and see if it's any better or at least noticeably different. `20`
(2s) seems like a good number for me.

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[Wayland-bugs] [Bug 93448] Trackpoint speed lock

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=93448

Peter Hutterer  changed:

   What|Removed |Added

 Status|NEEDINFO|ASSIGNED

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[Wayland-bugs] [Bug 93448] Trackpoint speed lock

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=93448

Juraj Fiala  changed:

   What|Removed |Added

 Attachment #122420|0   |1
is obsolete||

--- Comment #12 from Juraj Fiala  ---
Created attachment 125725
  --> https://bugs.freedesktop.org/attachment.cgi?id=125725=edit
Recording of the drag.

I noticed the drag around 08:22:44, but it's likely it started a bit sooner.

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[Wayland-bugs] [Bug 93448] Trackpoint speed lock

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=93448

--- Comment #10 from Peter Hutterer  ---
yeah, a timestamp would help because I can cut down the recording to the last
couple of events that matter.

fwiw, evemu 2.4 has been released since, you can use --autorestart to have it
restart logfiles after a timeout.

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[Wayland-bugs] [Bug 93448] Trackpoint speed lock

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https://bugs.freedesktop.org/show_bug.cgi?id=93448

--- Comment #9 from Juraj Fiala  ---
Yes, I'm still here, the bug still occurs. Sorry for the delay, I had no free
time at the end of the school year and my summer job just ended today so maybe
I'll finally get to this. Question though, will it help if I post a timestamp
where the bug occurred along with the log?

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[Wayland-bugs] [Bug 93448] Trackpoint speed lock

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https://bugs.freedesktop.org/show_bug.cgi?id=93448

--- Comment #8 from Peter Hutterer  ---
ping?

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[Wayland-bugs] [Bug 93448] Trackpoint speed lock

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https://bugs.freedesktop.org/show_bug.cgi?id=93448

--- Comment #7 from Peter Hutterer  ---
fwiw, if you grab evemu from git it now has the functionality to auto-resume
new recordings when the device is quiet for a while, so you don't have to wrap
it into a script.

so, unfortunately, this recording doesn't help much, it looks like completely
normal x/y movement of the trackpoint. this can be a problem: either the hw
keeps sending events even when you're not touching it or libinput gets stuck
somewhere. The recording here only has one gap at 12.5 seconds into it where no
events happen for ~1.5 seconds. from your description this doesn't sound like
that's the occurance of the bug, right?

you get this bug without scrolling too, right? trackpoint motion events are a
very simple code path that doesn't have any state, we just forward kernel
events. so this indicates too that it's a hw issue.

try if you can reproduce it with large pressure values in one direction,
historically this has been how you can poke the trackpoint into doing something
weird.

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[Wayland-bugs] [Bug 93448] Trackpoint speed lock

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https://bugs.freedesktop.org/show_bug.cgi?id=93448

--- Comment #5 from Juraj Fiala  ---
OK so I finally managed to catch something. My automated script didn't work and
I didn't have any more time so I just left it, but today I managed to catch the
bug while scrolling, and since it won't stop if until I stopped scrolling, I
managed to alt+tab to a terminal and run the command. Heres the output. I let
the bug do its thing while holding the middle scroll button down and sometimes
moving the mouse, and then I let go. I think I saw a tiny move after that, then
it stopped. Hope you can dig something useful from it. It's only a few seconds.

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[Wayland-bugs] [Bug 93448] Trackpoint speed lock

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https://bugs.freedesktop.org/show_bug.cgi?id=93448

--- Comment #6 from Juraj Fiala  ---
Created attachment 122420
  --> https://bugs.freedesktop.org/attachment.cgi?id=122420=edit
trackpoint speed lock recording

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[Wayland-bugs] [Bug 93448] Trackpoint speed lock

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https://bugs.freedesktop.org/show_bug.cgi?id=93448

--- Comment #4 from Peter Hutterer  ---
yeah, just cancel it and restart it regularly. this command produces a
recording of the input event sequence, if you end up with an hour-long
recording it may take me that long to replay it here - not very conductive to
quick fixes ;)

if you restart it every 2 minutes you have only the last 2 min in the log, much
easier to analyse.

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[Wayland-bugs] [Bug 93448] Trackpoint speed lock

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https://bugs.freedesktop.org/show_bug.cgi?id=93448

--- Comment #3 from Juraj Fiala  ---
Hey, sorry for the delay, didn't have much time. It happened thrice today but I
still don't have an idea when it happens.

Also, noticed that it's just trying to reach a certain position. When it
reaches it it stops pulling. The target is just a few pixels aways, and it
seems to be relative to the cursor. Or maybe it just needs a moment without any
mouse movement to do it's thing. I dunno. It's weird.

Shall I just run the command in the background?

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[Wayland-bugs] [Bug 93448] Trackpoint speed lock

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https://bugs.freedesktop.org/show_bug.cgi?id=93448

--- Comment #2 from Peter Hutterer  ---
ping?

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[Wayland-bugs] [Bug 93448] Trackpoint speed lock

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https://bugs.freedesktop.org/show_bug.cgi?id=93448

Peter Hutterer  changed:

   What|Removed |Added

 Status|NEW |NEEDINFO

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[Wayland-bugs] [Bug 93448] Trackpoint speed lock

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https://bugs.freedesktop.org/show_bug.cgi?id=93448

Peter Hutterer  changed:

   What|Removed |Added

 CC||peter.hutte...@who-t.net

--- Comment #1 from Peter Hutterer  ---
run sudo evemu-record on the trackpoint device and check if there are still
events coming out of the kernel when this happens. This way we can identify
where the issue lies.

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[Wayland-bugs] [Bug 93448] Trackpoint speed lock

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https://bugs.freedesktop.org/show_bug.cgi?id=93448

Bug ID: 93448
   Summary: Trackpoint speed lock
   Product: Wayland
   Version: unspecified
  Hardware: Other
OS: All
Status: NEW
  Severity: normal
  Priority: medium
 Component: libinput
  Assignee: wayland-bugs@lists.freedesktop.org
  Reporter: doctorjellyf...@riseup.net

Hey.

I have a Lenovo Thinkpad X220 and I used the trackpoint all the time. However I
often encounter this bug where the trackpoint speed gets locked in a certain
direction, and it keeps pulling the cursor until I press a button on the
keyboard. Sometimes it's rarely noticeable but considerably worsens accuracy,
making it very frustrating. I don't know under what conditions it happens, even
though I try to notice every time.

If you need any more info, just ask. Thanks.

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