I have an ATi Mobility X1400 GPU (Thinkpad Z61m) and I see the
following:

* The fglrx driver refuses to start, saying "No screens found"
* With the radeon / ati driver plus the 2.6.28 kernel, I get a hard lockup in X 
shortly after it starts. My system responds to SysRq.
* Rolling back to the 2.6.27 kernel which I was using with intrepid, I have a 
working X environment, but only if I disable Xinerama and DRI.
* With Xinerama enabled, using the radeon driver and a 2.6.27 kernel, I get a 
segfault on X startup:

Backtrace:
0: /usr/bin/X(xorg_backtrace+0x26) [0x4f1b66]
1: /usr/bin/X(xf86SigHandler+0x41) [0x485a61]
2: /lib/libc.so.6 [0x7f1a98db1040]
3: /usr/bin/X(dixLookupPrivate+0x4) [0x4347f4]
4: /usr/bin/X(xf86RandR12CreateScreenResources+0x50) [0x4b58e0]
5: /usr/bin/X [0x4abb8f]
6: /usr/bin/X(main+0x264) [0x433c34]
7: /lib/libc.so.6(__libc_start_main+0xe6) [0x7f1a98d9c5a6]
8: /usr/bin/X [0x433219]
Saw signal 11.  Server aborting.

I also got a similar segfault (slightly different backtrace mentioning
DRI) with 'Option "DRI"' in my xorg.conf -- but I can't be sure that
wasn't also triggered by Xinerama.

I'm attaching the failsafeX tarball from the segfaulting run.

** Attachment added: "failsafeX-backup-090403234024.tar"
   http://launchpadlibrarian.net/24965495/failsafeX-backup-090403234024.tar

-- 
xorg is terribly slow after Intrepid -> Jaunty upgrade
https://bugs.launchpad.net/bugs/334066
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