Ah actually, a bit of googling for the error message showed that this is
probably https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/982889
Essentially, lightdm tries to start up X before the kernel drm driver
has finished initializing. Or, perhaps, it is in a race condition with
plymouth (disabling splash in the kernel boot command can test this to
verify or disprove).
>From dmesg:
[ 18.208298] [drm] Initialized nouveau 1.1.0 20120801 for 0000:01:00.0 on
minor 0
>From Xorg.0.log:
[ 18.207] Initializing built-in extension DRI2
So, it looks to me like DRI2 was initialized before the Nouveau DRM was
ready. For some workarounds, see the above bug link.
I'm not sure there is much we can do on the X side, I think we would
need to make sure X is not started until the kernel has reported DRM
ready (I was under the impression we already had such a check in place,
but given that bug 982889 is still open, maybe not?) If you'd like to
work towards a real fix for this, can you touch base with Andy
Whitcroft?
** Changed in: xserver-xorg-video-nouveau (Ubuntu)
Assignee: Maarten Lankhorst (mlankhorst) => (unassigned)
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https://bugs.launchpad.net/bugs/1115177
Title:
X fails to start - [drm] failed to set drm interface version
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