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
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