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[Bug 1204939] Re: Unity doesn't start on ATI test machine (Mir fails to respond to drm_auth_magic request)

To: xubuntu-dev@xxxxxxxxxxxxxxxxxxx
From: Didier Roche <didrocks@xxxxxxxxxx>
Date: Wed, 21 Aug 2013 09:49:06 -0000
Reply-to: Bug 1204939 <1204939@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

seems this issue is in the radeon driver.

We looked with Thomas for a couple of hours this particular issue and
came to the conclusion this one seems to appear only when switching from
traditional Xorg to a Mir environment back and force after having some
GPU load. The radeon driver seems to not really support that and
performances are dropping until we get to a really bad situation when
the machine is stuck.

Performance of glmark2 (under some loads are run in parallel) are getting down quickly, to even 0 FPS in some case after switching (installing/removing unity-system-compositor and restarting the container or lightdm):
Xorg (running glmark2 tests) -> Mir (running glmark2 tests) -> Xorg (running glmark2 tests)

The driver is kept being loaded in the host.

** Also affects: xserver-xorg-video-ati (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1204939

Title:
  Unity doesn't start on ATI test machine (Mir fails to respond to
  drm_auth_magic request)

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