The log shows that xorg is hitting an issue there:
Backtrace: [100314.770] 0: /usr/bin/X (xorg_backtrace+0x37) [0x80a66f7] [100314.770] 1: /usr/bin/X (0x8048000+0x62b3a) [0x80aab3a] [100314.770] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0x1c340c] [100314.770] 3: /lib/i386-linux-gnu/libc.so.6 (0x276000+0x117771) [0x38d771] [100314.770] 4: /usr/lib/xorg/modules/drivers/intel_drv.so (0x52a000+0xe85c) [0x53885c] [100314.770] 5: /usr/lib/xorg/modules/drivers/intel_drv.so (0x52a000+0x1066c) [0x53a66c] [100314.770] 6: /usr/lib/xorg/modules/drivers/intel_drv.so (0x52a000+0x27873) [0x551873] [100314.770] 7: /usr/bin/X (0x8048000+0xe643a) [0x812e43a] [100314.771] 8: /usr/bin/X (0x8048000+0x26997) [0x806e997] [100314.771] 9: /usr/bin/X (0x8048000+0x2a117) [0x8072117] [100314.771] 10: /usr/bin/X (0x8048000+0x1c70c) [0x806470c] [100314.771] 11: /lib/i386-linux-gnu/libc.so.6 (__libc_start_main+0xf3) [0x28f113] [100314.771] 12: /usr/bin/X (0x8048000+0x1ca21) [0x8064a21] [100314.771] Bus error at address 0xa38ba008
The log shows that xorg is hitting an issue there:
Backtrace: +0x37) [0x80a66f7] rt_sigreturn+ 0x0) [0x1c340c] linux-gnu/ libc.so. 6 (0x276000+0x117771) [0x38d771] xorg/modules/ drivers/ intel_drv. so (0x52a000+0xe85c) [0x53885c] xorg/modules/ drivers/ intel_drv. so (0x52a000+0x1066c) [0x53a66c] xorg/modules/ drivers/ intel_drv. so (0x52a000+0x27873) [0x551873] linux-gnu/ libc.so. 6 (__libc_ start_main+ 0xf3) [0x28f113]
[100314.770] 0: /usr/bin/X (xorg_backtrace
[100314.770] 1: /usr/bin/X (0x8048000+0x62b3a) [0x80aab3a]
[100314.770] 2: (vdso) (__kernel_
[100314.770] 3: /lib/i386-
[100314.770] 4: /usr/lib/
[100314.770] 5: /usr/lib/
[100314.770] 6: /usr/lib/
[100314.770] 7: /usr/bin/X (0x8048000+0xe643a) [0x812e43a]
[100314.771] 8: /usr/bin/X (0x8048000+0x26997) [0x806e997]
[100314.771] 9: /usr/bin/X (0x8048000+0x2a117) [0x8072117]
[100314.771] 10: /usr/bin/X (0x8048000+0x1c70c) [0x806470c]
[100314.771] 11: /lib/i386-
[100314.771] 12: /usr/bin/X (0x8048000+0x1ca21) [0x8064a21]
[100314.771] Bus error at address 0xa38ba008