Radeon display controller not working with xorg on testing with kernels 2.6.15 and up

[Benjamin Lerman]

 Hi all,

 I have a dual head box with a radeon and an intel display controller.
Here is the lspci output :

dara ~ $ lspci | grep -i vga    
0000:00:02.0 VGA compatible controller: Intel Corporation 82915G/GV/910GL Express Chipset Family Graphics Controller (rev 04)
0000:05:04.0 VGA compatible controller: ATI Technologies Inc RV280 [Radeon 9200 PRO] (rev 01)

 I'm using debian testing with the kernel 2.6.12-1-386 and all is
working well.

 Now, when I try to upgrade the kernel, be it linux-image-2.6.15-1-686,
linux-image-2.6.15-1-686-smp or a custom 2.6.17.1 kernel, I cannot
launch Xorg.

 If I try to have the 2 cards working, Xorg won't launch. Same result
with just the ATI one. If I launch only the Intel one, all works well.

 My xorg.conf is there : http://www.ambre.net/misc/xorg.conf
 The Xorg failure logs are there : http://www.ambre.net/misc/Xorg.0.log.old

 Does anyone already meet this problem, or know how to resolve it ?

 Thanks in advance,

	Benjamin Lerman