Comment 2 for bug 918769

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Bryce Harrington (bryce) wrote :

Hmm, familiar sounding bug, but not really anything in the logs to say what's going on in this case.

[ 16.600] (II) intel(0): Output eDP1 connected
[ 16.600] (II) intel(0): Output VGA1 disconnected
[ 16.600] (II) intel(0): Output HDMI1 disconnected
[ 16.600] (II) intel(0): Output DP1 disconnected
[ 16.600] (II) intel(0): Output HDMI2 disconnected
[ 16.600] (II) intel(0): Output HDMI3 disconnected
[ 16.600] (II) intel(0): Output DP2 disconnected

Could be another eDP problem; I see your system has its panel connected like that. There's been a lot of work on that recently due to various bugs. The 3.2 kernel supposedly had quite a few fixes for eDP, but evidently not enough.

Presumably if you disable the laptop display and use an external display on VGA or HDMI it should work. That might be worth testing as a workaround if you have a spare monitor.

These types of bugs are typically issues in the kernel drm kms code, so given you see different kernels are used in live cd vs. installation, that would be a reasonably thing to look at. In fact, let's have you test an upstream kernel snapshot, just in case this issue is already solved:

  http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-next/

Also test this one, in case the fix is still in testing:

  http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-next/

If neither of those kernels solves the problem, let me know and we can notify Intel and go from there.