The Monitor and System settings crashed when I configuring my monitor(Benq FP92W) to to display in widescreen the traceback follows.
Display Sys(no debugging symbols found)
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
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[Thread debugging using libthread_db enabled]
[New Thread -1233299232 (LWP 5752)]
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[KCrash handler]
#6 0xb7f43410 in __kernel_vsyscall ()
#7 0xb7ceedf0 in raise () from /lib/tls/i686/cmov/libc.so.6
#8 0xb7cf0641 in abort () from /lib/tls/i686/cmov/libc.so.6
#9 0xb7ce843b in __assert_fail () from /lib/tls/i686/cmov/libc.so.6
#10 0xb68196f4 in xcb_xlib_lock () from /usr/lib/libxcb-xlib.so.0
#11 0xb69eac8c in ?? () from /usr/lib/libX11.so.6
#12 0x0805a9d8 in ?? ()
#13 0x0000011b in ?? ()
#14 0xb6ab7000 in ?? ()
#15 0x00804d1c in ?? ()
#16 0xb6a8fa4c in ?? () from /usr/lib/libX11.so.6
#17 0x0805a468 in ?? ()
#18 0xbf9b154c in ?? ()
#19 0xb69c7225 in XFreeCursor () from /usr/lib/libX11.so.6
Backtrace stopped: frame did not save the PC
Display Sys(no debugging symbols found)
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
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[Thread debugging using libthread_db enabled]
[New Thread -1233299232 (LWP 5752)]
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[KCrash handler]
#6 0xb7f43410 in __kernel_vsyscall ()
#7 0xb7ceedf0 in raise () from /lib/tls/i686/cmov/libc.so.6
#8 0xb7cf0641 in abort () from /lib/tls/i686/cmov/libc.so.6
#9 0xb7ce843b in __assert_fail () from /lib/tls/i686/cmov/libc.so.6
#10 0xb68196f4 in xcb_xlib_lock () from /usr/lib/libxcb-xlib.so.0
#11 0xb69eac8c in ?? () from /usr/lib/libX11.so.6
#12 0x0805a9d8 in ?? ()
#13 0x0000011b in ?? ()
#14 0xb6ab7000 in ?? ()
#15 0x00804d1c in ?? ()
#16 0xb6a8fa4c in ?? () from /usr/lib/libX11.so.6
#17 0x0805a468 in ?? ()
#18 0xbf9b154c in ?? ()
#19 0xb69c7225 in XFreeCursor () from /usr/lib/libX11.so.6
Backtrace stopped: frame did not save the PC