Bug 105447

Created attachment 138009 [details]
evemu-record log

Created attachment 138010 [details]
libinput debug-events 1.10.2 log (bad)

Created attachment 138011 [details]
libinput debug-events 1.10.1 log (good)

(In case it's relevant, RMI4 on this laptop is affected by bug 100436, so it might just be garbage-in, garbage-out...)

(In reply to Mantas Mikulėnas from comment #4)
> (In case it's relevant, RMI4 on this laptop is affected by bug 100436, so it
> might just be garbage-in, garbage-out...)

Hmm, I just remembered I can test the legacy PS/2 mode using 'modprobe.blacklist=i2c_hid'. (Fortunately 4.15.x supports PS/2 fallback – older kernels didn't.)

With the touchpad in PS/2 mode, libinput 1.10.2 missed only 2 scrolls out of nearly a hundred.

So yes, looks like the problem is definitely caused (or at least worsened) by the kernel RMI4 bugs.

(In reply to Mantas Mikulėnas from comment #0)
> I upgraded from 1.10.1 to 1.10.2, and it stopped recognizing about half of
> my two-finger-scroll attempts, treating them as plain pointer movements. (I
> can even run the old and new `libinput debug-gui` side-by-side, and the
> former recognizes all my scrolls while the latter misses nearly half of
> them.)
> 
> This is on a full-multitouch touchpad (Synaptics) in RMI4 mode.
> 
> libinput 1.10.1 / 1.10.2
> linux 4.15.7
> Synaptics s3203 (RMI4 mode)

Exactly the same issues on an Apple Internal Trackpad (bcm5974) after upgrading to 1.10.2.

If it is between 1.10.1 and 1.10.2 and easy to reproduce, git bisecting will be the fastest way to identify what changed. afaict that evemu-record scrolls just fine, with only one motion event in the whole log.

I'll need a libinput debug-events --verbose output too please, that'll show if the pressure sensitivity is getting in the way.

(In reply to Peter Hutterer from comment #7)
> If it is between 1.10.1 and 1.10.2 and easy to reproduce, git bisecting will
> be the fastest way to identify what changed. afaict that evemu-record
> scrolls just fine, with only one motion event in the whole log.

Bisected it to 1c15e162b835 ("touchpad: add a TOUCH_MAYBE_END state").

But I see that in master you've already fixed it by d8db6b5927f6 ("touchpad: end hovering touches in maybe_end_touch").

Created attachment 138060 [details]
run 2: evemu-record log

Created attachment 138061 [details]
run 2: libinput debug-events --verbose (1.10.2 bad)

Created attachment 138062 [details]
run 2: libinput debug-events --verbose (1.10.1 good)

So it works on master now?

(In reply to Peter Hutterer from comment #12)
> So it works on master now?

Yes, master has no scrolling problems.

ok, thanks for testing. closing as fixed with d8db6b5927f6 based comment 8, that fix will land in 1.10.3 as well.