** Also affects: mir (Ubuntu)
Importance: Undecided
Status: New
** Changed in: mir (Ubuntu)
Importance: Undecided => High
** Changed in: mir (Ubuntu)
Status: New => Triaged
** Changed in: canonical-devices-system-image
Status: Triaged => Fix Committed
** Changed in: canonical-devices-system-image
Assignee: Daniel van Vugt (vanvugt) => Stephen M. Webb (bregma)
** Changed in: canonical-devices-system-image
Milestone: None => u8c-1
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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to mir in Ubuntu.
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 Committed
Status in Mir:
Fix Committed
Status in Mir 0.26 series:
Fix Committed
Status in mir package in Ubuntu:
Triaged
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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