Sorry I forgot, you can also enable the drm debug flag without unloading and 
reloading it:
echo 1 | sudo tee /sys/module/drm/parameters/debug
And to turn it off again, if the machine hasn't crashed yet :)
echo 0 | sudo tee /sys/module/drm/parameters/debug

(For those interested in debugging, I added this to
https://wiki.ubuntu.com/Bugs/AtiDriver)

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ATI Radeon 9200 / 9250 PCI black screen and console freeze with DRI
https://bugs.launchpad.net/bugs/114520
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