This should be taken care of outside of Mir.
Currently the issue occurs due to the unity-system-compositor stopping
the compositor before the shell/greeter has a change to show any
shutdown animation.
On display power off:
powerd sends D-Bus signal setScreenPowerMode("off") to
com.canonical.Unity.Screen
unity-system-compositor receives signal, stops mir compositor and turns off
screen
powerd emits DisplayPowerStateChange signal
unity8 shell receives DisplayPowerStateChange - attempts to show greeter
rendering is blocked since USC stopped compositor.
There may some frames queued up with content before greeter animation hence the
issue reported here.
On display power on:
powerd sends D-Bus signal setScreenPowerMode("on") to com.canonical.Unity.Screen
unity-system-compositor receives signal, starts compositor and turns on screen
mir compositor starts, unity8 shell rendering continues from where it left off.
For now a workaround is to add a configurable delay at power off in
unity-system-compositor:
https://code.launchpad.net/~albaguirre/unity-system-compositor/add-power-off-delay-option/+merge/208281
The ideal solution is better coordination between powerd, the
shell/greeter and USC; The shell should be given an opportunity to show
a shutdown animation.
Maybe Mir could add a parameter to the compositor stop to specify how
many frames to render before actually stopping though I don't see this
as necessary.
Perhaps the shell should be in charge of notifying USC when to power off
instead.
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https://bugs.launchpad.net/bugs/1233564
Title:
Wrong frame is seen on wake up/resume/unlock.
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