Ubuntu
xserver-xorg-video-intel package

  1. Bug #745112
  2. Comment #26

Comment 26 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)

On lp #747205 we discovered by creating a new user account, that having certain RANDR operations present in monitors.xml would trigger it, presumably because gnome-settings-daemon would pick up those configuration settings and try applying them, triggering an underlying bug in RANDR. Perhaps fiddling with the primary monitor setting did it?

734756 collected register dumps on the issue, and experimented with some dpms forcing from the userspace side. My elderberry PPA was found to have some positive effects, but didn't fix it sufficiently completely to warrant pursuing that to work around the kernel issue. drm-intel-next-proposed did not boot on this reporter's hardware.

Video and photos are available on bug #750259. We also examined gpu error states and found this bug is not a gpu lockup issue (as 747205 suggested). The drm-intel-next-proposed kernel from around 4/21 was found to fix it.

Bug #737891 includes reports of this issue, among other problems. Maverick was re-tested via livecd and the issue was not reproduced (maybe for the same reasons as creating a new account in bug 747205 did not reproduce? Reporters also found that deleting monitors.xml has an ameliorative effect.) Fiddling with which monitor was listed as primary in monitors.xml appeared also to resolve things for at least one person.