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[Launchpad Bug Tracker <1486522@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package mesa - 10.5.9-2ubuntu1~vivid2

---------------
mesa (10.5.9-2ubuntu1~vivid2) vivid; urgency=medium

  * skl-dont-use-the-pma-depth-stall-workaround.diff: Fix GPU hangs in
    certain cases. (LP: #1486522)

mesa (10.5.9-2ubuntu1~vivid1) vivid; urgency=medium

  * Backport to vivid. (LP: #1471213)

 -- Timo Aaltonen <tjaalton@xxxxxxxxxx>  Wed, 19 Aug 2015 21:32:42 +0300

** Changed in: mesa (Ubuntu Vivid)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1486522

Title:
  [SKL] GPU hang with webgl demo

Status in mesa package in Ubuntu:
  Fix Released
Status in mesa-lts-vivid package in Ubuntu:
  Invalid
Status in mesa-lts-vivid source package in Trusty:
  Fix Released
Status in mesa source package in Vivid:
  Fix Released

Bug description:
  [Impact]

  Mesa 10.5.x suffers from a GPU hang on Skylake HW, bisected fix in
  10.6.x:

  commit 74fd226e34d0cf5e9ff43174ae69b4a66f5de1ab
  Author: Ben Widawsky <benjamin.widawsky@xxxxxxxxx>
  Date:   Wed Mar 25 16:52:46 2015 -0700

      i965/skl: Don't use the PMA depth stall workaround

  the system freezes soon after, causing loss of data.

  [Test Case]

  * installl chromium version 41.x (webgl disabled on later versions)
  * open https://jbouny.github.io/fft-ocean/
  * grab the ship, rotate quickly
  * should freeze in a few seconds

  [Regression Potential]

  * none, it's a gen9 specific workaround

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