Bug#585962: Hangs during boot unless radeon.modeset=0 is used

[Salvo Isaja <salvois@users.sourceforge.net>]

Package: linux-image-2.6.32-5-686
Version: 2.6.32-15

I had this problem on Squeeze after dist-upgrading with Synaptic 2010-06-13. 
After a few seconds, the screen turns black with random horizontal gray 
garbage, and the system hangs totally (keyboard leds included). After several 
reboots, I've seen the last line on screen was related to drm. I've 
experimented a little bit and found that passing "radeon.modeset=0" to the 
kernel command line, the system works as before.

My system is based on an AMD Sempron 3200+ with a Sapphire X1300 graphics 
card. FWIW I use the radeonhd driver on Xorg.

I suspect linux-image is not the right package for this report, since it 
entered testing on 2010-06-11 and it ran fine for the subsequent two days. 
Unfortunately I'm not skilled enough to be able to find a suitable package in 
those entered on 2010-06-13. Since then, the problem shows even if I boot the 
previous linux-image-2.6.32-3-686, the "rescue (single user) mode" does not 
help.

Please let me know if I can help tracing this.
Thanks,
   Salvo
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