Hello!
Here's the backtrace, as collected by gdb with "logging on".
The following lines in the logfile appear before "backtrace full"
command:
Starting program: /usr/bin/Xorg -keeptty -dumbSched
[Thread debugging using libthread_db enabled]
[New Thread 0xb7b7a6b0 (LWP 7204)]
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb7b7a6b0 (LWP 7204)]
0xb7ab56ef in CailWriteATIRegister (CAIL=0x8ea8990, idx=19789, data=3959875633)
at ../../src/radeon_atombios.c:2061
2061 ../../src/radeon_atombios.c: No such file or directory.
in ../../src/radeon_atombios.c
** Attachment added: "gdb-xorg.txt"
http://launchpadlibrarian.net/18213076/gdb-xorg.txt
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: Incomplete => New
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[intrepid] Xorg fails to start xserver-xorg-video-radeon (CD_INVALID_OPCODE)
https://bugs.launchpad.net/bugs/274234
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