Backtrace:
0: X(xf86SigHandler+0x6a) [0x486e2a]
1: /lib/libc.so.6 [0x7f64a5732f60]
2: /usr/lib/libpixman-1.so.0 [0x7f64a6551428]
3: /usr/lib/xorg/modules//libfb.so(fbCopyNtoN+0x26e) [0x7f64a30773ae]
4: /usr/lib/xorg/modules//libfb.so(fbCopyRegion+0x81) [0x7f64a3076231]
5: /usr/lib/xorg/modules//libfb.so(fbDoCopy+0x443) [0x7f64a3076833]
6: /usr/lib/xorg/modules//libfb.so(fbCopyArea+0x4c) [0x7f64a30769dc]
7: X [0x53186e]
8: X [0x4df1a6]
9: X [0x4ef2f5]
10: X [0x52ecd3]
11: X [0x52eee6]
12: X [0x52f9da]
13: X(compPaintWindowBackground+0x51) [0x4c4501]
14: X(miWindowExposures+0x1f2) [0x4e12e2]
15: X(miHandleValidateExposures+0x2b) [0x4f711b]
16: X [0x492817]
17: /usr/lib/xorg/modules/drivers//vesa_drv.so [0x7f64a3cd4ddc]
18: X [0x48dad5]
19: X(xf86SwitchMode+0xe2) [0x483ee2]
20: X [0x4a48b6]
21: X [0x4a4ad1]
22: X(RRCrtcSet+0x164) [0x526b74]
23: X(ProcRRSetCrtcConfig+0x526) [0x527206]
24: X(Dispatch+0x342) [0x44f7e2]
25: X(main+0x4a5) [0x436bd5]
26: /lib/libc.so.6(__libc_start_main+0xe6) [0x7f64a571f1a6]
27: X(FontFileCompleteXLFD+0x281) [0x435e99]

Fatal server error:
Caught signal 11.  Server aborting

XIO:  fatal IO error 11 (Resource temporarily unavailable) on X server ":1.0"
      after 15 requests (12 known processed) with 0 events remaining.