https://bugs.freedesktop.org/show_bug.cgi?id=105963
Bug ID: 105963
Summary: Lenovo P50 - Slow fine touchpad movement makes it jump
(bug 2)
Product: Wayland
Version: unspecified
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: libinput
Assignee: [email protected]
Reporter: [email protected]
as requested https://bugs.freedesktop.org/show_bug.cgi?id=105022#c40
making a new bug report, following on from that comment:
Tim:
can we move this to a separate bug please? This one is too noisy to still
figure out what's going on. As a general tip - when you're working on libinput,
put printfs in everywhere and run either sudo ./build/libinput-debug-events
(commandline) or sudo ./build/libinput-debug-gui (a GUI). No need to install
and restart X just for basic testing.
If even the above makes no difference, it's likely that the model flag is never
applied, put a printf in for that in evdev.c.
> I plan to understand the acceleration logic and change it somehow, so that
> there must be a certain number of events before acceleration is applied,
> similar to the idea in the code above.
That's an interesting idea. We previously had code that we required N events
for the pointer to start moving, but that didn't work well, too laggy. But not
having acceleration for the first N events could work (N <=2, I suspect...)
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