Hmm it seems this bug refuses to expire.
Can't be reproduced any more and only happens using a rendering approach
we have never used.
** No longer affects: mesa
** Changed in: mir
Status: Incomplete => New
** Changed in: mir
Status: New => Incomplete
** Changed in: mir
Status: Incomplete => Invalid
** Changed in: mesa (Ubuntu)
Status: Incomplete => Won't Fix
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https://bugs.launchpad.net/bugs/1377872
Title:
Double-buffered compositing performance is sometimes very poor (30
FPS) on intel
Status in Mir:
Invalid
Status in mesa package in Ubuntu:
Won't Fix
Bug description:
Double-buffered compositing performance is sometimes artificially poor
on some intel systems. When this happens the frame rate seen is halved
- about 30 FPS. However at the same time, Mir is observed to use very
little render time and both the CPU and GPU are still mostly idle.
It's just the Intel DRM logic sometimes takes two frames (~32ms) to
complete a single page flip.
Two known workarounds avoid the issue:
(a) Add glFinish() into the mesa DisplayBuffer code; or
(b) env INTEL_DEBUG=sync for the Mir server binary.
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