[Bug 309927] [NEW] random crash with vertical stripes

[Vu Ngoc San]

Public bug reported:

Binary package hint: xserver-xorg-video-intel

I'm having this bug for one year with kubuntu 7.10,8.04 and 8.10 on a
Dell latitude D630, with Intel GM965 video card.

Randomly, the system crashes with some kind of vertical stripes (or 'ladders') across the screen.
Keyboard and mouse is not responsive. Even ALT+SYS don't work. I have to hard reboot using the power button.
See screenshot (from hardy).

It can happen when I'm working, but it seems that most of the time it happens when I do nothing.
Sometimes it happens a few seconds after login dialog (like in screenshot).

It is very difficult to debug because it occurs about only once every
two weeks.

Is see no timed trace in log files. Only thing that could be related is
(EE) intel(0): underrun on pipe B! 
in Xorg.0.log
That's why I put it under xserver-xorg-video-intel (I'm using now version 2:2.4.1-1ubuntu10)
I use a dual screen setup in xorg.conf (even when I'm not connected to an external monitor), but I think it happened also with a plain setup.

Interestingly it has happen a couple of time when I was listening to
music, and after crash I could still hear some distorted sound...

First I thought it was hardware problem, but all tests passed
successfully and I even had Dell change the motherboard.

I also ran kubuntu from an external HD, and it crashed again anyway.

So you guys are my last hope :)

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New

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random crash with vertical stripes
https://bugs.launchpad.net/bugs/309927
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