[Wayland-bugs] [Bug 73367] New: Weston assumes touch device is in touch up state at startup... touch points out of sync

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73367

          Priority: medium
            Bug ID: 73367
          Assignee: wayland-bugs at lists.freedesktop.org
           Summary: Weston assumes touch device is in touch up state at
                    startup... touch points out of sync
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: ullysses.a.eoff at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: weston
           Product: Wayland

Weston always assumes touch devices are in a touch "up" state when it starts
up.  However, if a touch device is in touch "down" state at Weston start-up,
then touch events get out of sync in Weston (due to num_tp mismatching) and
touch doesn't work.

The following warnings are printed to the Weston log, dependent on whether the
device has single-touch capabilities or multi-touch capabilities, respectively:

touch event received with 0 points down but no surface focused
touch event received with -4 points down but no surface focused

1. Place finger on touch device
2. Launch Weston
3. Release finger from touch device
4. Randomly touch the device in various locations
5. Observe clients do not respond to touch and Weston logs (above) warnings.

wayland (master) heads/master-0-gcd0dccd
drm (master) libdrm-2.4.50-0-g4c5de72
mesa (master) heads/master-0-gd41f539
libva (master) libva-1.2.1-0-g88ed1eb
intel-driver (master) 1.2.1-0-g8f306e3
weston (master) heads/master-0-g95fdc37
efl (efl-1.8) heads/efl-1.8-0-g3801c0d
elementary (elementary-1.8) heads/elementary-1.8-0-gb357bb1
wayland-fits (master) heads/master-0-gcd75d94

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