I have ran into what I believe is the same problem. I get a similar stack trace:
Backtrace:
0: /usr/bin/X(xf86SigHandler+0x94) [0x10092df4]
1: [0x100344]
2: /usr/bin/X(VidModeGetCurrentModeline+0x3c) [0x1009769c]
3: /usr/lib/xorg/modules/extensions//libextmod.so [0xf971c84]
4: /usr/bin/X [0x10135380]
5: /usr/bin/X(Dispatch+0x38c) [0x1004ad4c]
6: /usr/bin/X(main+0x4a4) [0x1002bcc4]
7: /lib/libc.so.6 [0xfb6db10]
8: /lib/libc.so.6 [0xfb6dcd0]

which happens when I run displayconfig-restore. Removing displayconfig-
restore enables me to login. Otherwise the X server just crashed during
KDE startup (I'm running kubuntu).

I'm running on a PPC Mac Mini. I don't really believe that's relevant, though. 
The videocard is (from lspci):
0000:00:10.0 VGA compatible controller: ATI Technologies Inc RV280 [Radeon 
9200] (rev 01)

I'm using the "radeon" X driver.

I didn't have these problems when I installed hardy. But when I did a
apt-get dist-upgrade today (for the very first time since installing
Hardy, I think) this problem started to appear.

-- 
[hardy] displayconfig-restore causes X to crash
https://bugs.launchpad.net/bugs/202164
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