I tried to boot some other kernels, and got mixed results:

- 2.6.39-997-generic_amd64 [latest one from drm-intel-next from kernel-ppa]
  -> black screen on boot, fan spinning up and lots of disk activity, but 
doesn't seem to boot

- 2.6.36-020636-generic_amd64 [an older one from 10.10, from the kernel-ppa]
  -> initally black screen, flickers, shows log messages for a second, then 
black forever (but actually boots, can hear login prompt sound)

- 2.6.35-28-generic_amd64 (2.6.35-28.50) [a previous one found on my system]
 -> boots fine, and eDP1 is gone from xrandr (yay!), but unstable, no network, 
various errors in syslog (e.g CPU power or thermal limit exceeded, etc.)

So, I'm back to 2.6.38-8-generic, but it seems more and more unstable wrt intel 
drm. I often get video freezes when plugging in VGA or changing modes with 
xrandr, with this in syslog: "BUG: unable to handle kernel NULL pointer 
dereference".
In case it helps, I'm attaching an extract from syslog with a few of these, 
including trace, but I suppose this might be a different bug?

** Attachment added: "freeze trace syslog extract"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/773734/+attachment/2109104/+files/intel_drm_freeze_trace.log

** Summary changed:

- [Natty] spurious eDP1 display detected as permanently connected, on i915
+ [Natty] [i915] spurious eDP1 display detected as permanently connected (HP 
ProBook 5320m)

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https://bugs.launchpad.net/bugs/773734

Title:
  [Natty] [i915] spurious eDP1 display detected as permanently connected
  (HP ProBook 5320m)

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