fbdev Virtual Regression?

[Pat Suwalski]

Hello,

I'm in a situation where I have a small ARM device outputting 720p via 
HDMI. The framebuffer is locked in the kernel, so the resolution is 
stuck at 1280x720. It's xserver 1.6.

However, there is some overscan. Since the modelines are fixed, I had 
hoped to fix it by creating a smaller Virtual (say 1200x640), and to 
offset it using "ViewPort 40 40".

While it happily takes Virtual sizes larger than 1280x720, it doesn't 
seem to want to go down below the native output size.

I could have sworn this was possible in the past. Could this be a 
regression with randr 1.2?

Cheers,
--Pat