Overriding console mode for KMS drivers

[Mike Pumford <mpumford%mudcovered.org.uk@localhost>]

I have a need to override the mode auto detected by the KMS console 
drivers in 8.0. The system in question is attached to an old TV via a 
HDMI->Component converter. The converter advertises modes up to 180p but 
the TV is only actually capable of 576p. I can see that the variables to 
set the mode are hooked up to proplib properties but I don't know how to 
set those properties or what to set them too. Any suggestions?

I did also try overriding the mode using xrandr after boot but that 
didn't seem to work. However that may have been because the userland 
code was from 6.x as I can't really upgrade this system to anything 
newer until I solve the mode problem.

Mike