application flashes before showing infographic after turning off screen

[Rick Spencer]

Steps:
0. Have a Nexus 4 with image 174 (bug may be on other devices, but this is the one I have for now)
1. Run any application (like Calendar)
2. press power button on the side to turn off screen
3. press power button to turn on the screen

Result:
The app shows briefly before the infographic displays "over it"

Expected:
When turning on the screen, only the infographic is visible

[Olli Ries (ories)]

confirmed behavior

[Daniel van Vugt (vanvugt)]

Unlocking sounds like that described in bug 1270245 too.

The hard part is refining this bug down to a point where we can reproduce it with pure Mir, taking Unity out of the equation. No luck yet...

[Daniel van Vugt (vanvugt)]

Can a Unity8 person please help us by describing the mechanics of how/when the "infographic" surface is created?

It sounds like it's just appearing a frame or so too late after Unity restarts the Mir compositor (as it does on un-sleep).

[kevin gunn (kgunn72)]

no ites not bug 1270245, its actually a duplicate of bug 1233564

[kevin gunn (kgunn72)]

i would recommend making bug 1233564 redundant as this description is better

[Michael Terry (mterry)]

Last time I talked to Mir folks about this, the solution sounded simple. They just need to clear all the queued buffers when the screen turns off. I think they've just been busy with other things.

[Daniel van Vugt (vanvugt)]

Yep, I discussed the same solution/workaround with greyback yesterday.

Flushing of the queued buffers normally never happens because it would wake up clients faster than the refresh rate. But to do it only on sleep/resume I think is fine. Assuming that really is the problem :)

[Daniel van Vugt (vanvugt)]

I'm going to make this one the duplicate. Because bug 1233564 already has some Unity8 work attached to it.