>From the X log, it is finding the dri card device file ok:

[     2.446] drmOpenDevice: node name is /dev/dri/card0
[     2.446] drmOpenDevice: open result is 9, (OK)
[     2.497] drmOpenByBusid: Searching for BusID pci:0000:00:02.0
[     2.497] drmOpenDevice: node name is /dev/dri/card0
[     2.497] drmOpenDevice: open result is 9, (OK)
[     2.497] drmOpenByBusid: drmOpenMinor returns 9

But then it runs into an interface version error:

[     2.497] drmOpenByBusid: Interface 1.4 failed, trying 1.1

Then it tries opening card1-15, then finally gives up, goes back to 0,
and acts confused:

[     2.547] drmOpenDevice: node name is /dev/dri/card14
[     2.551] drmOpenByBusid: drmOpenMinor returns -1
[     2.551] drmOpenDevice: node name is /dev/dri/card15
[     2.555] drmOpenByBusid: drmOpenMinor returns -1
[     2.555] drmOpenDevice: node name is /dev/dri/card0
[     2.555] drmOpenDevice: open result is 9, (OK)
[     2.555] drmOpenDevice: node name is /dev/dri/card0
[     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.

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

Title:
  X trying to start faster than drm driver is ready

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https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/982889/+subscriptions

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