Comment 38 for bug 982889

Thanks for the logs.

Unfortunately neither of these match the OP's sequence of events, and thus does not hit the problematic drm loading race that the original reporter was seeing. So, not surprising that this patch does nothing for your cases. I'd like to see someone who has Thomas' bug to test this. Specifically, if on startup you see in /var/log/Xorg.0.log a sequence of messages like this:

[ 2.555] drmOpenDevice: open result is 9, (OK)
[ 2.555] drmGetBusid returned ''
[ 2.555] (EE) intel(0): [drm] failed to set drm interface version.
[ 2.555] (EE) intel(0): Failed to become DRM master.
[ 2.555] (II) intel(0): Creating default Display subsectio

Then it's worth testing the patch in the PPA, and I think it will fix that case (or at least give us more specific data).

@Adam, I'd want to see the Xorg.0.log from the first boot, when you get dumped into low graphics mode. And maybe Xorg.0.log.old. The log you posted appears to be from a successful session so that doesn't illuminate why the failed session failed.

@Franck, it's possible your bug (#1129220) is distinct and was incorrectly duped here, but it does seem that your issue belongs with this general "class" of problems. However I think a different kind of fix will be needed in your case.