I have the same issue.
I did a clean installation with 8.10. While configuring the dual head with
Radeon Mobility X600, I saw the similar stack trace.
----
(II) Loading /usr/lib/xorg/modules//amdxmm.so
(II) Module amdxmm: vendor="X.Org Foundation"
compiled for 1.4.99.906, module version = 1.0.0
ABI class: X.Org Server Extension, version 1.1
Backtrace:
0: /usr/X11R6/bin/X(xf86SigHandler+0x79) [0x80c3009]
1: [0xb7f99400]
2: /usr/lib/xorg/modules//amdxmm.so(amdxmmInit+0x42c) [0xb63b6b2c]
3: /usr/lib/xorg/modules/drivers//fglrx_drv.so [0xb7717cac]
4: /usr/lib/xorg/modules/drivers//fglrx_drv.so(atiddxScreenInit+0x799)
[0xb770e6c9]
5: /usr/X11R6/bin/X(AddScreen+0x19f) [0x807137f]
6: /usr/X11R6/bin/X(InitOutput+0x206) [0x80aa536]
7: /usr/X11R6/bin/X(main+0x279) [0x8071b19]
8: /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe5) [0xb7b9a685]
9: /usr/X11R6/bin/X [0x8071101]
Saw signal 11. Server aborting.
--
8.543 Crashes on login screen
https://bugs.launchpad.net/bugs/284505
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