Further notes... The issue seems to occur on frames where some but not
all of the outputs are dirty. So one output makes it through to callback
(sna_xmir_copy_to_mir), but the other does not:
_X_EXPORT void
xmir_screen_for_each_damaged_window(xmir_screen *xmir, xmir_window_proc
callback)
{
xmir_window *xmir_win, *tmp_win;
xorg_list_for_each_entry_safe(xmir_win, tmp_win, &xmir->damage_list,
link_damage) {
if (xmir_window_has_free_buffer(xmir_win) &&
xmir_window_is_dirty(xmir_win))
(*callback)(xmir_win, xmir_window_get_dirty(xmir_win));
}
}
XMir is intentionally designed to only redraw dirty outputs. So not all
get swapped every frame. I wonder however if that is somehow
incompatible with how the intel DDX works?
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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:
In Progress
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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