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)
Status in Mir:
Triaged
Status in “xserver-xorg-video-ati” package in Ubuntu:
New
Bug description:
Sometimes when running on the i386 ATI jenkins box, XMir hangs when
Compiz is started.
When it's hung, it's blocked in DRI2Authenticate, in mir_wait_for on
the results of mir_drm_auth_magic.
Applying http://paste.ubuntu.com/5983202/ to Mir to debug this, we
get:
Client output - http://paste.ubuntu.com/5981035/
Server output - http://paste.ubuntu.com/5981019/
So it appears that the second drm_auth_magic request is written to the
socket but Mir never responds to it.
I have no idea why, though. When I attached gdb to unity-system-
compositor in the hung case there didn't seem to be any deadlocked
thread or the like; everything seemed to be waiting on input.
==== Original report ====
The log files are deceptive - the error comes from the failsafe X
session which is started for some reason.
LightDM, unity-system-compositor, and XMir all come up fine and have
no unexpected log output.
gnome-session.log, however, has
"""
I/O error : Bad file descriptor
/usr/share/compiz/place.xml:1: parser error : Document is empty
^
/usr/share/compiz/place.xml:1: parser error : Start tag expected, '<' not
found
^
I/O error : Bad file descriptor
compizconfig - Info: Backend : gsettings
compizconfig - Info: Integration : true
compizconfig - Info: Profile : unity
compiz (core) - Info: Loading plugin: composite
compiz (core) - Info: Starting plugin: composite
compiz (core) - Info: Loading plugin: opengl
(polkit-gnome-authentication-agent-1:10828): polkit-gnome-1-WARNING **:
Unable to determine the session we are in: No session for pid 10828
compiz (core) - Info: Unity is fully supported by your hardware.
compiz (core) - Info: Unity is not supported by your hardware. Enabling
software rendering instead (slow).
compiz (core) - Info: Starting plugin: opengl
"""
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