In article <Pine.LNX.4.61.0610092215220.13823@smaug.linux.pwf.cam.ac.uk>
I write:
>I've done a few experiments.  The problem manifests more severely with 
>VRAM installed than removed.  In the no-VRAM case the bottom line of the 
>screen doesn't update, but everything else is fine.  With and without 
>VRAM, vidcvideo(4) is using the same video mode.  In both cases, my 
>keyboard seems not to respond at the "root device" prompt, but caps lock 
>toggles correctly, and I can break into DDB wherethe keyboard works 
>correctly.  This is all rather mystifying.

The keyboard problem turned out to be an entirely different bug in 
iomdkbc(4), which I've fixed separately.

-- 
Ben Harris