Interesting! Well, the logs look ok; your system is seeing your monitor
and graphics card capabilities just fine, and the logs look perfectly
normal. Which, obviously, is a blatant lie.
Now, you have sandybridge graphics, and we certainly have had some
reported issues with graphics on these systems. I think the CRTC
mapping may be off in some situations. Fortunately these types of
issues are getting high priority attention upstream, if we can collect
the right info.
Enable drm debugging. Run `sudo xdiagnose`, it's the first checkbox.
Enable it, hit apply, wait for grub to rebuild, then reboot and collect
`sudo dmesg > dmesg.txt` and post that here. We can review that to see
if it is a CRTC mapping issue.
It sounds like you're currently running an earlier version that does not
have this bug? If so, please collect 'xrandr --verbose > xrandr.txt`
from that earlier version and post that here too. We can review that to
see if it is an EDID/modeline issue.
With an external monitor attached, run the command `xrandr --output
LVDS1 off; xrandr --output LVDS1 --auto` which will see if simply re-
loading the display is enough to get it initialized properly.
** Changed in: xorg (Ubuntu)
Importance: Undecided => High
** Changed in: xorg (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/912992
Title:
Primary laptop display not working, external monitor works fine.
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