Comment 6 for bug 287413

Hmm, the report I was thinking of has been marked as a duplicate of this bug... I don't think the two errors are in fact the same, since the call stack is different, and the error message is different. Even so, I've got an update to this sorry saga. For some time I've been playing hide and seek with this error, sometimes thinking it's been fixed, only to boot the PC one day and *bam*, suddenly X won't start properly again and I have to jump through hoops (so it seemed) to get it working again. I've however today noticed something interesting, after having done a clean reinstallation of 8.10 again on the problem machine: The "fglrx" driver only works reliably for me, if you hot-boot (with reset button say, or shutdown) after having run Windows. If you do this, then booting into Ubuntu using fglrx works fine. If however you cold-boot directly into Ubuntu, then the error message mentioned in the duplicate bug results, as follows:

(EE) fglrx(0): Failed to allocate CMM buffer (size=16384, alignment=4096)!
(==) fglrx(0): Using hardware cursor
(EE) fglrx(0): Failed to allocate CMM buffer (size=4096, alignment=4096)!
(EE) fglrx(0): Failed to allocate CMM buffer (size=4096, alignment=4096)!

Backtrace:
0: /usr/X11R6/bin/X(xf86SigHandler+0x79) [0x80c3009]
1: [0xb7f16400]
2: /usr/lib/xorg/modules/drivers//fglrx_drv.so(atiddxLoadLogo+0x70) [0xb76b6770]
3: /usr/lib/xorg/modules/drivers//fglrx_drv.so(atiddxLogoInit+0x14e) [0xb76b68ce]
4: /usr/lib/xorg/modules/drivers//fglrx_drv.so(atiddxScreenInit+0x8ec) [0xb769081c]
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) [0xb7b1d685]
9: /usr/X11R6/bin/X [0x8071101]
Saw signal 11. Server aborting.

I attach the log and config as saved by failsafe X.

Further, for reference, lspci lists my video card as:
walterp@test-desktop:~$ sudo lspci | grep ATI
01:00.0 VGA compatible controller: ATI Technologies Inc R360 NJ [Radeon 9800 XT]
01:00.1 Display controller: ATI Technologies Inc RV350 NJ [Radeon 9800 XT] (Secondary)