Syncing task from Mir.
** Changed in: mir (Ubuntu)
Importance: Undecided => Low
** Changed in: mir (Ubuntu)
Status: New => Triaged
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https://bugs.launchpad.net/bugs/1274819
Title:
(Desktop) display tears slightly for one frame when waking from sleep
mode
Status in Mir:
Triaged
Status in mir package in Ubuntu:
Triaged
Bug description:
(Desktop) display tears slightly for one frame when waking from sleep
mode.
Test case:
1. Start mir_demo_server_shell
2. Start mir_demo_client_SOMETHING that will animate constantly
3. Alt+P to put the display to sleep
4. Alt+P to wake the dislplay
Expected: The client continues being composited flawlessly.
Observed: Slight tearing when the display comes back on. But it only seems to
last about one frame.
I think the problem is mesa::Display::resume() calling
schedule_set_crtc. I know it needs to, but resetting the CRTC(s) does
a page flip without synchronization to vblank. So that's probably the
one frame of tearing.
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