I have to correct that this error message in dmesg does not show up till X is started.
I've generated the bug-report, and it looks like this error is about some reserved memory in my system. Just compare the memory regions:
*** ls: -r--r--r-- 1 root root 0 2010-09-19 01:21:46.873999998 +0200 /proc/iomem
00000000-0000ffff : reserved
00010000-0009efff : System RAM
0009f000-0009ffff : reserved
000a0000-000bffff : PCI Bus 0000:00
000c0000-000dffff : PCI Bus 0000:00
I can submit the kernel .config if you want that, too. But I don't think there'd be much to see...
Hopefully we're able to pin down this issue.