Ubuntu
xserver-xorg-video-intel package

  1. Bug #745112
  2. Comment #18

Comment 18 for bug 745112

Revision history for this message
Bryce Harrington (bryce) wrote : Re: [arrandale] desktop is messed up (goes black) when laptop is docked with two external 1920x1200 monitors (x86_64)

Hi Roland, thanks for the quick response.

Regarding your clarification, yes despite how it may seem, "blank screen with moving mouse cursor and X not responding to input, but network login works" is the prototypical set of symptoms that go with a GPU hang. The kernel itself is ok, which is why you can ssh in; the mouse cursor is handled far enough outside the core of X that it is often unaffected by lockups (not always though). Often when you have a GPU lockup, there will be an error message in your 'dmesg' output. The file /sys/kernel/debug/dri/0/i915_error_state often displays error codes when the GPU is locked up. In fact, if you could reproduce the bug with the classic/no-effects case and attach both of those here, it might give us some more clue what's going wrong. Or, at least, it gives me plenty of info to take upstream.

Regarding the second conflating bug (which I suspect might be a DPMS bug in the kernel's arrandale code), I've a PPA you could try to see if it at least improves that situation:

  https://launchpad.net/~bryce/+archive/elderberry