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Krillin, rc-proposed/bq_aquaris.en r422

Description:
All at once taps have become incredibly delayed, by 1 or 2 secs.
Gestures still work ok, no delay there.
Swiping the greeter -> no delay. Tapping numbers to input code on the greeter --> 2 secs delay. Even though both are parts of unity8. So it doesn't seem to only be a problem of unity8 clients, but also unity8 itself.
I have no idea why horizontal/vertical swipes would be unaffected, though.

The virtual keyboard is also completely unusable because of the huge
delay that each tap has.

Also noticed that the vibration is gone, taps don't trigger vibration
anymore.

Webview also seemed to be unaffected by the delays (although I'm not
entirely sure, the bug is now gone)

I also restarted unity8 and unity8-dash with Mir input logging enabled. That showed that the touch events were being delivered as expected, no delay.
restart unity8 MIR_CLIENT_INPUT_RECEIVER_REPORT=log and
restart unity8-dash MIR_CLIENT_INPUT_RECEIVER_REPORT=log

Restarting lightdm (that forces the restart of unity-system-compositor)
fixed the issue.

Additional info: I had Mir touchspots visualization enabled, which are
known to cause more stuttering, but I think they're unlikely to be the
cause of this bug, I had them enabled for 2 weeks and haven't noticed
any problem like this before.

This is the log from a tap on an icon in the shell:
[2016-09-06 10:52:51.876400] <DEBUG> input-receiver: Received event:touch_event(when=54593678129000 (6.030520ms ago), from=3, touch = {{id=0, action=down, tool=finger, x=426.211, y=292.695, pressure=0.85098, major=19.963, minor=0, size=19.963}, modifiers=1)
[2016-09-06 10:52:51.953821] <DEBUG> input-receiver: Received event:touch_event(when=54593751953000 (9.709366ms ago), from=3, touch = {{id=0, action=change, tool=finger, x=426.211, y=292.695, pressure=0.843137, major=19.963, minor=0, size=19.963}, modifiers=1)
[2016-09-06 10:52:51.954343] <DEBUG> input-receiver: Received event:touch_event(when=54593761256000 (0.958751ms ago), from=3, touch = {{id=0, action=up, tool=finger, x=426.211, y=292.695, pressure=0.843137, major=19.963, minor=0, size=19.963}, modifiers=1)


SEE VIDEO ATTACHMENT BELOW

** Affects: ubuntu-ui-toolkit (Ubuntu)
     Importance: Undecided
         Status: New

-- 
[Krillin] Taps are delayed by 1-2seconds, although gestures are not. Keyboard is thus unusable
https://bugs.launchpad.net/bugs/1620553
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