Yellowdog 6.1 for the PS3 fixed a few problems of not being able to display all the pixels of a 1920x1080p display without going into /etc/X11/xorg.conf and commenting out your current display parameters. Enabling the mode (133 instead of 5) is done by going into /etc/yaboot.conf and changing:
append="video=ps3fb:mode:5 rhgb quiet root=LABEL=/1"
to
append="video=ps3fb:mode:133 rhgb quiet root=LABEL=/1"
In Yellowdog 5.0 and some later versions, after doing the above you also needed to edit your xorg.conf. In Yellowdog 6.1, it seems that the parameters are ignored now, even though they are not commented out. This is kind of a wrong way to go about it, but it does seem to lessen one step in the setup.
