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Sometimes touchpad input becomes very laggy.
It seems to be related to suspending the laptop. I think it also has to
do with other mice being plugged in/out.
Often, suspending and waking up immediately afterwards makes the pointer
fluent again.
This is not the only problem I see with this touchpad/driver:
Sometimes the pointer stops moving horizontally as if it got stuck in a
scrolling gesture.
Sometimes the pointer (almost) stops moving completely. Suspending often but
not always helps.
I am not sure whether these problems are related.
I am happy to debug the problem, but I don't know where to start.
>> xinput list
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ SynPS/2 Synaptics TouchPad id=10 [slave pointer (2)]
⎜ ↳ TPPS/2 IBM TrackPoint id=11 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
↳ Power Button id=6 [slave keyboard (3)]
↳ Video Bus id=7 [slave keyboard (3)]
↳ Sleep Button id=8 [slave keyboard (3)]
↳ AT Translated Set 2 keyboard id=9 [slave keyboard (3)]
↳ ThinkPad Extra Buttons id=12 [slave keyboard (3)]
↳ Integrated Camera: Integrated C id=13 [slave keyboard (3)]
>> lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04.2 LTS
Release: 20.04
Codename: focal
>> cat /proc/bus/input/devices
...
I: Bus=0011 Vendor=0002 Product=0007 Version=01b1
N: Name="SynPS/2 Synaptics TouchPad"
P: Phys=isa0060/serio1/input0
S: Sysfs=/devices/platform/i8042/serio1/input/input5
U: Uniq=
H: Handlers=mouse0 event5
B: PROP=5
B: EV=b
B: KEY=e520 10000 0 0 0 0
B: ABS=660800011000003
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: bot-comment
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SynPS/2 Synaptics TouchPad choppy movement after suspend
https://bugs.launchpad.net/bugs/1931044
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