Public bug reported: OS/kernel version:
$ uname -a
Linux NO01LD-P01144 6.14.0-36-generic #36~24.04.1-Ubuntu SMP PREEMPT_DYNAMIC
Wed Oct 15 15:45:17 UTC 2 x86_64 x86_64 x86_64 GNU/Linux
Yesterday I updated libinput as you can see from my /var/log/dpkg file:
2025-12-05 08:10:06 upgrade libinput-bin:amd64 1.25.0-1ubuntu3.1
1.25.0-1ubuntu3.2
2025-12-05 08:10:06 upgrade libinput10:amd64 1.25.0-1ubuntu3.1 1.25.0-1ubuntu3.2
At the same time, yesterday my mouse started lagging. The lag is
sporadic, it may work fine for a while, it may stop up for several
seconds, and it may just lag a bit for a while only moving in short
random bursts.
I've tried three different types of mice, all of which have this
problem: a mouse with a USB Bluetooth dongle, a mouse with a USB cable,
and a mouse with direct Bluetooth to the computer. This leads me to
believe it's not a USB issue nor a Bluetooth issue.
I tried running libinput debug-events from libinput-tools. Below is an
example where the mouse lagged a bit and jumped in position.
event25 POINTER_MOTION +19.015s -36.00/ 0.00 (-18.00/ +0.00)
event25 POINTER_MOTION +19.094s -35.96/ -3.60 (-20.00/ -2.00)
event25 POINTER_MOTION +19.094s -56.83/-11.00 (-31.00/ -6.00)
event25 POINTER_MOTION +19.096s -46.00/-10.00 (-23.00/ -5.00)
event25 POINTER_MOTION +19.104s -38.00/-10.00 (-19.00/ -5.00)
event25 POINTER_MOTION +19.182s -282.00/-132.00
(-141.00/-66.00)
event25 POINTER_MOTION +19.182s -32.00/-22.00 (-16.00/-11.00)
event25 POINTER_MOTION +19.182s -38.00/-32.00 (-19.00/-16.00)
event25 POINTER_MOTION +19.191s -13.76/-13.76 ( -7.00/ -7.00)
event25 POINTER_MOTION +19.199s -27.51/-129.71 (-14.00/-66.00)
event25 POINTER_MOTION +19.217s 5.60/-18.66 ( +3.00/-10.00)
event25 POINTER_MOTION +19.225s 8.58/-20.60 ( +5.00/-12.00)
event25 POINTER_MOTION +19.234s 10.00/-22.00 ( +5.00/-11.00)
event25 POINTER_MOTION +19.234s 26.00/-42.00 (+13.00/-21.00)
I've attached the journal log for the current boot (journalctl -b 0), in
case anything there may be of interest.
I have tried to reboot, to no avail.
I hope I've provided enough information, please let me know if there is
something more I need to add.
** Affects: libinput (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "journal_mouse_lag.log"
https://bugs.launchpad.net/bugs/2133928/+attachment/5931543/+files/journal_mouse_lag.log
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https://bugs.launchpad.net/bugs/2133928
Title:
All mouse devices start lagging sporadically after libinput update
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