В 02:05 +0200 на 23.09.2011 (пт), mampir[@nospam] написа:
> I don't have any video problems with Totem though. 

Might be a coincidence, or just my card.

> 
> Would someone explain what KMS is and does, how one can check if its
> running, and how one can turn it on and off? 

KMS means kernel mode-setting. With it the resolution and the color
depth are set at boot time by the kernel. The Xorg server then uses
them. I think the drivers for most cards support KMS and it is on by
default. Since you have the same issue with the black screen in virtual
consoles I say it is on. It could be turned on/off by
the /etc/modprobe.d/radeon.conf file or kernel boot parameter, but I
don't remember the parameter name.

> I don't have a "/etc/modprobe.d/radeon.conf" file.

You could create the file. Bellow is the contents of the file. [1] Each
line follows the modprobe configuration syntax. [2] Full list of options
for every module is available by the modinfo command. [3] Settings will
take effect after restart.

[1] 
$ cat /etc/modprobe.d/radeon.conf
options radeon modeset=0

[2] 

man modprobe.conf

[3] modinfo radeon |less

>   Is "modest=0" a typo, and shouldn't
> it be "modeset=0" or "modset=0"?

Yes it is a typo. This is my specialty. :) :/ :(

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