Comment 7 for bug 992391

I have experienced this bug on my laptop with every version of Ubuntu since 11.04 at least (I'm not certain if it occurred in 10.10). For this reason I am still running 10.04 where it does not occur. It also happens in Kubuntu and in Fedora 17.

I have my laptop lugged into an external monitor via HDMI most of the time. The problem usually starts when I switch to just the external display, with the laptop screen off. Behaviour appears normal for a few second to a couple of minutes. Then the mouse and keyboard stop responding, and eventuall y the screen will flash and go dark.

Sometimes I am able to switch to a non-X terminal and do a soft restart. Other times I will not be able to do that and have to just power down.

My Xorg log is attached.

My background is Java not C, but I'm more than happy to try to provide extra info or run tests if that would be helpful.

        *-display:0
             description: VGA compatible controller
             product: Mobile GM965/GL960 Integrated Graphics Controller
             vendor: Intel Corporation
             physical id: 2
             bus info: pci@0000:00:02.0
             version: 0c
             width: 64 bits
             clock: 33MHz
             capabilities: bus_master cap_list rom
             configuration: driver=i915 latency=0
             resources: irq:29 memory:fea00000-feafffff memory:e0000000-efffffff(prefetchable) ioport:eff8(size=8)
        *-display:1 UNCLAIMED
             description: Display controller
             product: Mobile GM965/GL960 Integrated Graphics Controller
             vendor: Intel Corporation
             physical id: 2.1
             bus info: pci@0000:00:02.1
             version: 0c
             width: 64 bits
             clock: 33MHz
             capabilities: bus_master cap_list
             configuration: latency=0
             resources: memory:feb00000-febfffff

agpgart 31724 2 drm,intel_agp
drm 163779 3 i915,drm_kms_helper
drm_kms_helper 29329 1 i915
i2c_algo_bit 5028 1 i915
i915 290035 2
intel_agp 24375 2 i915
output 1871 1 video
vga16fb 11385 0
vgastate 8961 1 vga16fb
video 17375 1 i915

bruce@mars:~$ uname -a
Linux mars 2.6.32-41-generic #91-Ubuntu SMP Wed Jun 13 11:44:43 UTC 2012 i686 GNU/Linux