>From Open Firware, I can do: 0 > dev screen 0 > show-modes
Which leads to 0 = 800 x 600 @ 60 Hz * CURRENT 1 = 800 x 600 @ 56 Hz - Disabled 2 = 640 x 480 @ 75 Hz 3 = 640 x 480 @ 72 Hz - Disabled 4 = 640 x 480 @ 67 Hz - Disabled 5 = 640 x 480 @ 60 Hz 6 = 8 x 1 @ 0 Hz - Not Available 7 = 8 x 1 @ 0 Hz - Not Available 8 = 1280 x 1024 @ 75 Hz 9 = 1024 x 768 @ 75 Hz a = 1024 x 768 @ 70 Hz - Disabled b = 1024 x 768 @ 60 Hz c = 1024 x 768 @ 43 Hz - Disabled d = 832 x 624 @ 75 Hz e = 800 x 600 @ 75 Hz f = 800 x 600 @ 72 Hz - Disabled 10 = 1152 x 870 @ 75 Hz - Disabled 11 = 800 x 600 @ 60 Hz - LCD - Not Available 12 = 800 x 600 @ 56 Hz - LCD - Not Available 13 = 640 x 480 @ 75 Hz - LCD - Not Available 14 = 640 x 480 @ 72 Hz - LCD - Not Available 15 = 640 x 480 @ 67 Hz - LCD - Not Available 16 = 640 x 480 @ 60 Hz - LCD - Not Available 17 = 8 x 1 @ 0 Hz - LCD - Not Available 18 = 8 x 1 @ 0 Hz - LCD - Not Available 19 = 1280 x 1024 @ 75 Hz - LCD - Not Available 1a = 1024 x 768 @ 75 Hz - LCD - Not Available 1b = 1024 x 768 @ 70 Hz - LCD - Not Available 1c = 1024 x 768 @ 60 Hz - LCD - Not Available 1d = 1024 x 768 @ 43 Hz - LCD - Not Available 1e = 832 x 624 @ 75 Hz - LCD - Not Available 1f = 800 x 600 @ 75 Hz - LCD - Not Available 20 = 800 x 600 @ 72 Hz - LCD - Not Available 21 = 1152 x 870 @ 75 Hz - LCD - Not Available 22 = 1680 x 1050 @ 60 Hz 23 = 800 x 600 @ 60 Hz - Disabled ok 0 >