Touch event delayed or missing with weston 1.8.0 and qtwayland 5.4.2

[Giulio Camuffo]

2015-11-20 13:28 GMT+02:00 Vikas Patil <vikasmpatil at gmail.com>:
> I think when I feel delay in touch. Seeing following log from weston
> (I added the prints) and evtest prints. I am testing this with button
> on HMI. When the button is pressed, it is displayed as pressed, but
> when released, the view is not updated immediately and it is still
> displayed as pressed for sometime and after very little delay it shows
> released.
>
> Could anyone give some inputs?

You should export the environment variable WAYLAND_DEBUG=1 on the
client side and check if the wl_touch events are coming correctly at
the right time. If they are the bug is probably in the client,
otherwise it's in the compositor.


--
Giulio

>
>
> weston log:
>
> [13:13:40.144] -----> notify_touch: WL_TOUCH_DOWN
> [13:13:40.144] -----> notify_touch: touch_grab_down
> [13:13:40.144] -----> notify_touch_frame
> [13:13:40.144] -----> notify_touch: touch_grab_frame
> [13:13:40.198] -----> notify_touch: WL_TOUCH_MOTION
> [13:13:40.198] -----> notify_touch: touch_grab_motion
> [13:13:40.198] -----> notify_touch_frame
> [13:13:40.198] -----> notify_touch: touch_grab_frame
> [13:13:40.208] -----> notify_touch: WL_TOUCH_MOTION
> [13:13:40.208] -----> notify_touch: touch_grab_motion
> [13:13:40.208] -----> notify_touch_frame
> [13:13:40.208] -----> notify_touch: touch_grab_frame
> [13:13:40.262] -----> notify_touch: WL_TOUCH_MOTION
> [13:13:40.262] -----> notify_touch: touch_grab_motion
> [13:13:40.262] -----> notify_touch_frame
> [13:13:40.262] -----> notify_touch: touch_grab_frame
> [13:13:40.342] -----> notify_touch: WL_TOUCH_UP
> [13:13:40.342] -----> notify_touch: touch_grab_up
> [13:13:40.342] -----> notify_touch_frame
> [13:13:40.342] -----> notify_touch: touch_grab_frame
>
> evtest log:
>
> Event: time 1444828420.143687, type 3 (EV_ABS), code 57
> (ABS_MT_TRACKING_ID), value 82
> Event: time 1444828420.143687, type 3 (EV_ABS), code 53
> (ABS_MT_POSITION_X), value 78
> Event: time 1444828420.143687, type 3 (EV_ABS), code 54
> (ABS_MT_POSITION_Y), value 431
> Event: time 1444828420.143687, type 3 (EV_ABS), code 58
> (ABS_MT_PRESSURE), value 35
> Event: time 1444828420.143687, -------------- EV_SYN ------------
> Event: time 1444828420.198068, type 3 (EV_ABS), code 53
> (ABS_MT_POSITION_X), value 74
> Event: time 1444828420.198068, -------------- EV_SYN ------------
> Event: time 1444828420.207220, type 3 (EV_ABS), code 53
> (ABS_MT_POSITION_X), value 73
> Event: time 1444828420.207220, type 3 (EV_ABS), code 54
> (ABS_MT_POSITION_Y), value 429
> Event: time 1444828420.207220, -------------- EV_SYN ------------
> Event: time 1444828420.261657, type 3 (EV_ABS), code 53
> (ABS_MT_POSITION_X), value 72
> Event: time 1444828420.261657, type 3 (EV_ABS), code 58
> (ABS_MT_PRESSURE), value 70
> Event: time 1444828420.261657, type 3 (EV_ABS), code 48
> (ABS_MT_TOUCH_MAJOR), value 4
> Event: time 1444828420.261657, -------------- EV_SYN ------------
> Event: time 1444828420.341950, type 3 (EV_ABS), code 57
> (ABS_MT_TRACKING_ID), value -1
> Event: time 1444828420.341950, -------------- EV_SYN ------------
>
> Best Regards,
> Vikash
>
> On Thu, Nov 19, 2015 at 8:59 PM, Vikas Patil <vikasmpatil at gmail.com> wrote:
>> Dear Community,
>>
>> I am using following components and seeing sometime touch doesn't
>> respond (seems touch_up event delayed or some touch event missing).
>> For example back button on screen takes time to go back to desired
>> screen or I need to touch it again.
>>
>> linux 3.14.28
>> weston 1.8.0 with ivi-shell
>> qt 5.4.2.
>> qtwayland 5.4.2 + patch to support touch
>>
>> I have checked with following two commands and it seems touch events
>> are proper from kernel and libinput.
>>
>> #libinput-debug-events --device /dev/input/event0
>> #evtest /dev/input/event0
>>
>> I am trying to understand what is happening but no luck yet. Has
>> anyone observed the same and fixed it? Could you give some
>> inputs/suggestions to understand and debug this?
>>
>> Thanking you for reading this.
>>
>> Thanks & Regards,
>> Vikas
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