OK, I've figured out a terrible hack that seems to solve the problem
(although it generates constant damage and constant CPU usage):
_X_EXPORT RegionPtr
xmir_window_get_dirty(xmir_window *xmir_win)
{
return &xmir_win->region; /* Terrible hack */
This seems to solve the bug, suggesting xmir_window_get_dirty is
returning incorrect damage regions.
It's not definitive and not a fix. But looks like good progress.
** Also affects: xorg-server (Ubuntu)
Importance: Undecided
Status: New
** Changed in: xorg-server (Ubuntu)
Status: New => Confirmed
** Changed in: xorg-server (Ubuntu)
Importance: Undecided => Critical
** Changed in: mir
Status: In Progress => Invalid
** Changed in: mir (Ubuntu)
Status: Confirmed => Invalid
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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1216472
Title:
[xmir] [multimonitor] Frames eventually get slightly out of order,
look like glitches or typing will feel slow
Status in Mir:
Invalid
Status in XMir:
Confirmed
Status in “mir” package in Ubuntu:
Invalid
Status in “xorg-server” package in Ubuntu:
Confirmed
Bug description:
Using ppa:mir-team/qa-testing and ppa:mir-team/qa-testing2, eventually
the frames you see get slightly out of order and slightly lagged.
I've only ever seen this bug in ppa:mir-team/qa-testing and ppa:mir-
team/qa-testing2 so there's a reasonable chance it's come from one of
the branches being tested there, which are not on trunk yet.
The issue seems more pronounced with bypass (qa-testing) but
eventually appears using qa-testing2 as well (no bypass).
It doesn't seem to happen when using a single monitor. Only with
multiple monitors. But possibly haven't tested enough to be sure.
TEST CASE:
Open a terminal in XMir and hold down a key.
Expected: Key appears to repeat smoothly.
Observed: Key sometimes appears to skip one character/frame ahead, and then
back again.
WORKAROUND (1)
1. sudo apt-get install compizconfig-settings-manager
2. ccsm &
3. CCSM > OpenGL > (untick everything except maybe "Sync To VBlank")
WORKAROUND (2)
Use simpler single buffering desktop environment, like Xfce.
WORKAROUND (3)
Unplug all external monitors. Use a single monitor :(
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