Alrighty, I've posted an update to the PPA for folks to test.
https://launchpad.net/~bryce/+archive/lp982889/

As before, it looks like i386 has built, but amd64 is having some
troubles - I've restarted it and hope it'll build by morning.  Those of
you on amd64 who are comfortable building packages locally may want to
just grab the .dsc and roll your own .debs.  Otherwise, hopefully the
PPA will rebuild amd64 by tomorrow.

Maarten Lankhorst theorized that the failure to 'reset' may be because
we need to forcefully set xserver as master of the DRM, so this patch
adds a call to drmSetMaster().  Unfortunately, with the limited testing
we've done so far we did not see this as truly fixing the bug.  Maarten
believes plymouth may not be handing the drm off properly, and has been
roughing up a plymouth patch to try to investigate that angle.

Anyway, along with the drmSetMaster() call, I've done a rewrite of the
patch, to make the logic a bit more presentable.  I also knocked the
timeout down to 2 seconds.  So, worst case, for those of you suffering
from this bug, this PPA should give you a slightly faster boot and
otherwise no change in behavior.  I've verified on my own (non-bugged)
hardware that at least the xserver boots up and works properly in the
non-bugged case.

For those of you wanting to do more testing on this issue, one thing to
try is disable plymouth completely.  It seems that simply specifying
nosplash on the kernel command line is insufficient to fully disable
plymouth, and it's thought that perhaps this may account for why some
people found the same troubles even though they turned the splash screen
off.

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to libdrm in Ubuntu.
https://bugs.launchpad.net/bugs/982889

Title:
  X trying to start before plymouth has finished using the drm driver

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/982889/+subscriptions

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