Comment 6 for bug 666715

Hello, I have the same problem on ThinkPad x100e, with ATI Radeon HD 3200 Graphics.
Problem appeared after being activated proprietary ati driver (fglrx) and reproduced only with Unity.

$ dmesg | grep -i fglrx
[ 13.081415] fglrx: module license 'Proprietary. (C) 2002 - ATI Technologies, Starnberg, GERMANY' taints kernel.
[ 13.553635] [fglrx] Maximum main memory to use for locked dma buffers: 1643 MBytes.
[ 13.553693] [fglrx] vendor: 1002 device: 9612 count: 1
[ 13.554230] [fglrx] ioport: bar 1, base 0x9000, size: 0x100
[ 13.554785] [fglrx] Kernel PAT support is enabled
[ 13.554818] [fglrx] module loaded - fglrx 8.78.6 [Oct 5 2010] with 1 minors
[ 14.337171] [fglrx] ATIF platform detected with notification ID: 0x81
[ 14.736803] [fglrx] GART Table is not in FRAME_BUFFER range
[ 14.744971] [fglrx] Could not enable MSI; System prevented initialization
[ 14.745981] [fglrx] Firegl kernel thread PID: 1141
[ 14.746378] [fglrx] IRQ 18 Enabled
[ 15.776809] [fglrx] Gart USWC size:552 M.
[ 15.776815] [fglrx] Gart cacheable size:215 M.
[ 15.776823] [fglrx] Reserved FB block: Shared offset:0, size:1000000
[ 15.776827] [fglrx] Reserved FB block: Unshared offset:14ffb000, size:5000

$ dmesg | grep -i mutter
[ 493.363128] mutter[2325]: segfault at 28 ip 080650c8 sp bfdf1800 error 4 in mutter[8048000+95000]
[ 612.710493] mutter[2331]: segfault at b1fe9000 ip 094a3fb6 sp bfbaa260 error 4 in libc-2.12.1.so[942e000+157000]