>From Christopher James:
that "no screens found" thing is because lightdm starts X before the kernel 
module has finished initialising.

>From robert_ancell:
(I just cut off the necessary quote)
<robert_ancell> nah, it needs to ask the kernel generally - and there's a 
signal for "card ready" that comes via udev I believe
<robert_ancell> start on ((filesystem
<robert_ancell>            and runlevel [!06]
<robert_ancell>            and started dbus
<robert_ancell>            and (drm-device-added card0 
PRIMARY_DEVICE_FOR_DISPLAY=1
<robert_ancell>                 or stopped udev-fallback-graphics))
<robert_ancell>           or runlevel PREVLEVEL=S)
<robert_ancell> is the upstart script /etc/init/lightdm.conf
<robert_ancell> it's the drm-device-added card0 PRIMARY_DEVICE_FOR_DISPLAY=1 
which is what is waited for - my guess is that driver is not doing that / doing 
it wrong
<robert_ancell> yes, afaik.  so the short answer is "it's probably a driver 
issue".

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https://bugs.launchpad.net/bugs/966871

Title:
  X failed to start, failed to set drm interface version

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