Comment 44 for bug 747205

On Wed, Apr 13, 2011 at 08:05:47PM -0000, Timothy Kross wrote:
> https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
> intel/+bug/759258 was marked as a duplicate, so it's seemingly the same
> bug. I didn't plug in an external monitor though, and I didn't get a a
> black screen, my got a while overlay for a few seconds, then it got back
> to normal and apport said that a system error occurred. I hope these
> logs can be of help.

Looking at the dupes, it appears apport is noticing the gpu lockup that
occurred with the original bug report and duping gpu lockups with the
same signature.

So, quite potentially there were two separate bugs going on:

  a) A gpu lockup (IPEHR: 0x7a005502)
  b) Black screen on VGA connection

The dupes to this bug report (so far) are all showing (a) but none have
much of a description so hard to say if they're seeing (b) as well.

However, separately there have been other reports of just issue (b):

750259 [arrandale] Dual screen not working/shows corruption (x86_64)
734756 [Arrandale] Blank screen when booting with external monitor (x86_64)
754799 [arrandale] external VGA output doesn't output anything (i686)
745112 [arrandale] desktop is messed up (goes black) when laptop is docked (x86_64)
756624 [pineviewgm] black screen attaching external monitor (x86_64)
758785 [arrandale] Display flickers or blank on login (x86_64)
761236 [Arrandale] unable to correctly enable monitors connected to VGA (x86_64)
762855 [sandybridge-m-gt2+] Display on external monitor (vga) is black on 13" MacBook Pro 8,1 (x86_64)

Possibly (a) and (b) are related, but for now let's treat them as
separate bugs.