This wasn't just a sync bug, but caused bad frame ordering too. You
could see bad frame ordering in mir_demo_client_egltriangle when it
straddled multiple monitors. And today I saw the same scary frame
ordering glitches in XMir --> bug 1291755
** Also affects: mir (Ubuntu)
Importance: Undecided
Status: New
** Changed in: mir (Ubuntu)
Status: New => Triaged
** Changed in: mir (Ubuntu)
Importance: Undecided => High
** Summary changed:
- [regression] Multi-monitor frame sync no longer works (not synchronized)
+ [regression] Multi-monitor frame sync no longer works (not synchronized), and
frames skip/jump/stutter
** Description changed:
[regression] Multi-monitor frame sync no longer works (not
synchronized).
Test case:
- 1. Start a multi-monitor server:
- mir_demo_server_shell --display-config sidebyside
- 2. Start a client:
- mir_demo_client_egltriangle
- 3. Move the client (Alt+drag) so it overlaps both monitors simultaneously.
+ 1. Start a multi-monitor server:
+ mir_demo_server_shell --display-config sidebyside
+ 2. Start a client:
+ mir_demo_client_egltriangle
+ 3. Move the client (Alt+drag) so it overlaps both monitors simultaneously.
- Expected: Client keeps reporting 60 FPS
- Observed: Client speeds up to 120 FPS.
+ Expected: Client keeps reporting 60 FPS and renders smoothly
+ Observed: Client speeds up to 120 FPS and judders/skips frames
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https://bugs.launchpad.net/bugs/1288570
Title:
[regression] Multi-monitor frame sync no longer works (not
synchronized), and frames skip/jump/stutter
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