Backtrace:
0: /usr/bin/X (xorg_backtrace+0x36) [0x560366]
1: /usr/bin/X (0x400000+0x1640c9) [0x5640c9]
2: /usr/lib/libpthread.so.0 (0x7fd2b5cbf000+0xf170) [0x7fd2b5cce170]
3: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fd2b2c96000+0xada32) [0x7fd2b2d43a32]
4: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fd2b2c96000+0xb39a8) [0x7fd2b2d499a8]
5: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fd2b2c96000+0x6b0d8) [0x7fd2b2d010d8]
6: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fd2b2c96000+0x5cb27) [0x7fd2b2cf2b27]
7: /usr/bin/X (BlockHandler+0x4a) [0x4382da]
8: /usr/bin/X (WaitForSomething+0x114) [0x55d714]
9: /usr/bin/X (0x400000+0x34281) [0x434281]
10: /usr/bin/X (0x400000+0x23615) [0x423615]
11: /usr/lib/libc.so.6 (__libc_start_main+0xf5) [0x7fd2b4b6b725]
12: /usr/bin/X (0x400000+0x238ed) [0x4238ed]

Segmentation fault at address (nil)

Fatal server error:
Caught signal 11 (Segmentation fault). Server aborting