• software: linux kernel 2.6.32 , xorg
• hardware : ati radeon igp 320m

$ dmesg
agpgart-ati 0000:00:00.0: Ati IGP320/M chipset
reserve_ram_pages_type failed 0x2c388000-0x2c389000, track 0x10, req0x10

* https://bugzilla.redhat.com/show_bug.cgi?id=602055 * http://forums.gentoo.org/viewtopic-p-6296933.html

This can be workarounded easly by disabling KMS for this driver :

grep modeset /etc/modprobe.d/radeon.conf 
options radeon modeset=0

Tested on :

$ X -version
X.Org X Server 1.7.7
Release Date: 2010-05-04
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.32.14-dsa-ia32 i686 Debian
Current Operating System: Linux nrv 2.6.32-trunk-686 #1 SMP Sun Jan 10 06:32:16 UTC 2010 i686
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-2.6.32-trunk-686 root=UUID=29763d26-afc7-4dff-90f7-c7fa247dc9d0 ro irqpoll
Build Date: 03 June 2010  04:08:50PM
xorg-server 2:1.7.7-2 (Julien Cristau <jcristau@debian.org>) 
Current version of pixman: 0.16.4

More :

• http://bugs.debian.org/580661
• http://wiki.archlinux.org/index.php/ATI
• http://en.wikipedia.org/wiki/Mode-setting#Linux

related: agpgart

@TaG: xrandr linux-kernel igp LinuX KerneL ModE SettinG