Also affects the intel DDX.
I keep finding myself tracing this bug into the Intel SNA code, which I
don't yet understand. The issue seems to occur on frames where not-
quite-all outputs are dirty, so sna_xmir_copy_to_mir() is only called
for some of them (but not all).
The bug goes away if I ensure sna_xmir_copy_to_mir() is called for all
outputs. So this seems to suggest that the Intel SNA code is keeping
track of frames/buffers and expecting a precise number of kgem_submit's,
which of course doesn't always happen with multimonitor.
** Also affects: xserver-xorg-video-intel (Ubuntu)
Importance: Undecided
Status: New
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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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