touch-packages team mailing list archive

[Daniel van Vugt <daniel.van.vugt@xxxxxxxxxxxxx>]

** Changed in: mir
     Assignee: Daniel van Vugt (vanvugt) => (unassigned)

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to mesa in Ubuntu.
https://bugs.launchpad.net/bugs/1377872

Title:
  Double-buffered compositing performance is sometimes very poor (30
  FPS) on intel

Status in Mesa:
  Confirmed
Status in Mir:
  Incomplete
Status in mesa package in Ubuntu:
  Incomplete

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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/mesa/+bug/1377872/+subscriptions