Comment 21 for bug 16873

I believe I'm hitting this bug as well. The system freezes (no kernel panic or
anything) shortly after starting the X server with the "ati" driver. Using the
"vesa" driver hasn't shown this. I have only found one possible clue. With the
"ati" driver, I start gdm. Then at the login screen I hit ctrl-alt-backspace.
I get this in /var/log/messages:

Jun 21 10:58:55 neasw3 kernel: __iounmap: bad address ffffff0010223000

Each time I ctrl-alt-backspace I get the same error with the same address. With
the "vesa" driver, I think I got this once, but not in response to anything, and
I can't seem to replicate it. Hopefully soon I'll get some time to try newer
xorg versions and other things. Is there any combinations of kernels and
whatnot that would be more useful for me to test?

uname -a : Linux neasw3 2.6.10-5-amd64-xeon #1 SMP Tue Jun 7 08:58:02 UTC 2005
x86_64 GNU/Linux
lspci :
0000:00:00.0 Host bridge: Intel Corp. Server Memory Controller Hub (rev 09)
0000:00:02.0 PCI bridge: Intel Corp. Memory Controller Hub PCI Express Port A0
(rev 09)
0000:00:1d.0 USB Controller: Intel Corp. 82801EB/ER (ICH5/ICH5R) USB UHCI #1
(rev 02)
0000:00:1d.1 USB Controller: Intel Corp. 82801EB/ER (ICH5/ICH5R) USB UHCI #2
(rev 02)
0000:00:1d.7 USB Controller: Intel Corp. 82801EB/ER (ICH5/ICH5R) USB2 EHCI
Controller (rev 02)
0000:00:1e.0 PCI bridge: Intel Corp. 82801 PCI Bridge (rev c2)
0000:00:1f.0 ISA bridge: Intel Corp. 82801EB/ER (ICH5/ICH5R) LPC Bridge (rev 02)
0000:00:1f.1 IDE interface: Intel Corp. 82801EB/ER (ICH5/ICH5R) Ultra ATA 100
Storage Controller (rev 02)
0000:00:1f.2 IDE interface: Intel Corp. 82801EB (ICH5) Serial ATA 150 Storage
Controller (rev 02)
0000:01:00.0 PCI bridge: Intel Corp. PCI Bridge Hub A (rev 09)
0000:01:00.1 PIC: Intel Corp. PCI Bridge Hub I/OxAPIC Interrupt Controller A
(rev 09)
0000:01:00.2 PCI bridge: Intel Corp. PCI Bridge Hub B (rev 09)
0000:01:00.3 PIC: Intel Corp. PCI Bridge Hub I/OxAPIC Interrupt Controller B
(rev 09)
0000:02:04.0 Ethernet controller: Intel Corp. 82541GI/PI Gigabit Ethernet
Controller (rev 05)
0000:04:03.0 Ethernet controller: Intel Corp. 82541GI/PI Gigabit Ethernet
Controller (rev 05)
0000:04:0d.0 VGA compatible controller: ATI Technologies Inc Radeon RV100 QY
[Radeon 7000/VE]

I'll attach dmesg output and /var/log/Xorg.0.log.