[Bug 384730] Re: [i945GM] screen goes black about once per day after upgrading to latest intel drivers

[Geir Ove Myhr]

I'm not sure what is going on here. It doesn't look like a typical GPU
freeze, since the keyboard is still working. If X would crash, it would
leave a backtrace (short version) at the end of Xorg.0.log.

The last line in your Xorg.0.log (during black screen)
(WW) intel(0): drmDropMaster failed: Unknown error 4294967295
is actually a totally innocent warning message that should happen whenever you use a new intel driver, an old enough kernel (pre 2.6.29, Jaunty has 2.6.28) and switch to a virtual terminal. The interesting thing is that it appears in the log after the screen went black, indicating that X is still somewhat alive when you hit Ctrl+Alt+F1. Maybe we can use this error message to our advantage. Could you:
1. Before the black screen occurs, verify that this error message shows up in Xorg.0.log every time you switch to a VT whenever you switch to a VT (and that you get multiple lines when you switch back and forth with Ctrl+Alt+F1 and Ctrl+Alt+F7). 
2. Given that the above works, could you switch VTs when the screen goes black and check if it still keeps adding this line when you switch back and forth?

Otherwise, to try and narrow down where the problem is, there is a list
at
https://wiki.ubuntu.com/X/Troubleshooting/Freeze#Narrow%20Subsystem%20it%20Occurs%20in
of things that you may try to turn off to find which subsystem it is in
(exept AccelMethod, since I guess then you're back to bug 379805). I
realize that it may take some time to test, since the bug doesn't
trigger very often.

It would also be interesting to know if the Virtual setting has anything
to say for this bug.

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[i945GM] screen goes black about once per day after upgrading to latest intel drivers
https://bugs.launchpad.net/bugs/384730
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