Bug#412228: AGP Radeon 9250 on K7 with DRI OK, on P!!! NOT

[Bob <spam@homeurl.co.uk>]

I have the same problem, with Radeon 9250 card in my Intel 815E based 
Asus CUSL2 P!!! box if I enable DRI X hangs.

If I pull the
(--) PCI:*(1:0:0) ATI Technologies Inc RV280 [Radeon 9200 PRO] rev 1,
(--) Chipset ATI Radeon 9250 5960 (AGP) found

and replace it with an
(--) PCI:*(1:0:0) ATI Technologies Inc RV280 [Radeon 9200] rev 1,
(--) Chipset ATI Radeon 9200 5962 (AGP) found

X starts with DRI enabled happy as a sand boy.

If I put the Radeon 9250 into my SIS735 based ECS K7S5A Duron 700 X 
starts with DRI enabled no problems.

They are all running stock Debian etch kernels, the Duron 700 is running 
2.6.18-5-k7 and I've tried the P!!! box on both 2.6.18-5-686 and 
2.6.18-5-486 kernels and the crash occurs with both, I can still ssh in 
and the system seems responsive enough but it takes about 15 minutes to 
shutdown.

Any debugging I can do?

Thanks