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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which is subscribed to xserver-xorg-video-ati in Ubuntu.
https://bugs.launchpad.net/bugs/1204939
Title:
Unity doesn't start on ATI test machine (Mir fails to respond to
drm_auth_magic request)
To manage notifications about this bug go to:
https://bugs.launchpad.net/mir/+bug/1204939/+subscriptions
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