Created attachment 36060 [details]
Xorg log with segfault details.

Chipset: GMA HD (Core i7 640LM)
System Architecture: Linux distorted 2.6.34-ARCH #1 SMP PREEMPT Mon May 17 08:36:58 UTC 2010 i686 Intel(R) Core(TM) i7 CPU L 640 @ 2.13GHz GenuineIntel GNU/Linux
Versions: libdrm 2.4.20 / OpenGL "2.1 Mesa 7.8.1" / xf86-video-intel 2.11 / xserver 1.8.1
Distribution: Arch Linux (testing repository)
System: Lenovo X201s
Display: LVDS at 1440x900@50 with VGA1 enabled at 1680x1050@60

Steps to reproduce, not always 100%:
1. Have mplayer open, watch movie
2. Close mplayer while movie is playing

Due to frequency of the above steps, I find the occurrence much more repeatable when replacing Flash with mplayer to watch YouTube videos using a Greasemonkey script as I go about my normal desktop usage.  I am not sure if mplayer being a Firefox plugin alters behaviour of the video overlay.  (Firefox 3.6 and mplayer SVN-r31303-4.5.0)

I do not have Compiz installed/enabled.  I am using regular 2D rendering (no compositing) with XFCE.

No xorg.conf.  All defaults.  Nothing in dmesg related to the Xorg segfault.  Xorg.0.log attached.