Closing the lid at the first sign of bootup enables clamshell mode, which makes all VRAM available to the external monitor. It won't do the resolutions/bit depths in questioned with spanned displays/segmented VRAM.

I ran the numbers to get the pixel counts, but didn't finish the calc. for VRAM requirement. Testing is easier and checks driver for 1080p/RAMDAC compatibility of the Pismo at the same time. I figured it to be a near run thing, if possible at all.