Backtrace:
(EE) 0: /usr/bin/X (xorg_backtrace+0x56) [0x7fdd0c8b7556]
(EE) 1: /usr/lib/xorg/modules/input/synaptics_drv.so (0x7fdd04466000+0x527e) [0x7fdd0446b27e]
(EE) 2: /usr/lib/xorg/modules/input/synaptics_drv.so (0x7fdd04466000+0x75a2) [0x7fdd0446d5a2]
(EE) 3: /usr/bin/X (0x7fdd0c704000+0x96708) [0x7fdd0c79a708]
(EE) 4: /usr/bin/X (0x7fdd0c704000+0xbfa79) [0x7fdd0c7c3a79]
(EE) 5: /lib/x86_64-linux-gnu/libc.so.6 (0x7fdd0a3ca000+0x352f0) [0x7fdd0a3ff2f0]
(EE) 6: /lib/x86_64-linux-gnu/libc.so.6 (__select+0x33) [0x7fdd0a4c7743]
(EE) 7: /usr/bin/X (WaitForSomething+0x1ac) [0x7fdd0c8b482c]
(EE) 8: /usr/bin/X (0x7fdd0c704000+0x57ec1) [0x7fdd0c75bec1]
(EE) 9: /usr/bin/X (0x7fdd0c704000+0x5c29b) [0x7fdd0c76029b]
(EE) 10: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf0) [0x7fdd0a3eaa40]
(EE) 11: /usr/bin/X (0x7fdd0c704000+0x4662e) [0x7fdd0c74a62e]
(EE)
(EE) [dix] DLLC6AE:00 06CB:75BF UNKNOWN: unable to find touch point 1
(EE) [dix] DLLC6AE:00 06CB:75BF UNKNOWN: unable to find touch point 1
(EE) [dix] DLLC6AE:00 06CB:75BF UNKNOWN: unable to find touch point 0
(EE) [dix] DLLC6AE:00 06CB:75BF UNKNOWN: unable to find touch point 0