Here's the culprit from #6: [ 3.018187] [drm] bad panel power
sequencing delays, disabling panel
And presumably without the external monitor attached, we read the values
the BIOS is using for the panel instead - and that with the external
attached, the BIOS is skipping the eDP.
That should be fixed by
commit 82ed61fa1a4e08d5f9e86fb1b715b50ed678b6ac
Author: Daniel Vetter <[email protected]>
Date: Sat Oct 20 20:57:41 2012 +0200
drm/i915: make edp panel power sequence setup more robust
in v3.8. Can you please try with the kernel from raring?
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https://bugs.launchpad.net/bugs/1076389
Title:
[12.10] eDP with external monitor plugged in, only external monitor
works
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