[Wayland-bugs] [Bug 67563] Touch events dropped after multiple touchpoints hit at once

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67563

--- Comment #7 from Kristian Høgsberg <krh at bitplanet.net> ---
(In reply to comment #6)
> Created attachment 86180 [details] [review]
> evdev: Flush motion events when the slot changes, not just after sync
> 
> Here is a patch to make the change mentioned above.
> 
> It does seem to fix the basic problem but I can still get it into a confused
> state if I rapidly hit and release the screen with four fingers. I wonder if
> this is a separate problem and is related to what Artie describes.

Good catch.  This must have blocked a lot of motion events too, since we only
report motion events on SYN too and only the most recently received slot then.

I think this should fix this bug (ie what Rusty reports), but I think it's
different from Arties problem in comment 4.  Arties case is where we have a
old-fashioned single-touch touchscreen that only reports BTN_TOUCH for touch
up/down and ABS_X/Y for position.  Patch applied, but we have to keep looking
for the single touch problem.

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