** Branch linked: lp:~ci-train-bot/mir/mir-ubuntu-zesty-2683
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https://bugs.launchpad.net/bugs/1666372
Title:
Nested servers (Unity8) periodically stutter (half frame rate) with
Mir 0.26.1
Status in Canonical System Image:
Fix Released
Status in Mir:
Fix Committed
Status in Mir 0.26 series:
Fix Released
Status in mir package in Ubuntu:
Fix Released
Bug description:
Nested servers periodically stutter (half frame rate) with Mir 0.26.1
On an old laptop, it's about half the time stuttering and half the
time smooth.
On a fast desktop, it only stutters occasionally like when a large
blur is active.
It seems the problem is Mir's predictive bypass optimization
conflicting with the new client-side vsync optimization. Both are
correct and desirable when used alone, but when used together they
conflict, presumably because the former requires perfect vsync phase
and the latter lacks correct vsync phase (which is still an exercise
for later).
A workaround to get more reliably smooth frame rates is to create a file:
/etc/lightdm/lightdm.conf.d/foo.conf
with contents:
[Seat:*]
unity-compositor-command=/usr/sbin/unity-system-compositor --composite-delay=0
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