Bug#643693: Panning failure: 1 or 2 pixels only

[ael <law_ence.dev@ntlworld.com>]

I now confirm that panning seems to be restricted to 1 or 2 pixels
(vertically in this case). 

To summarize, before the recent upgrades, panning worked as expected.
With a hardware screen with 1024x600 pixels, after issuing the xrandr
command, I could pan vertically across the virtual 1024 pixels.

After the upgrades, and the same xrandr command, the panning seems
to be restricted to approximately 601 or 602 pixels.

This is surely a bug, or is the xrandr command not the correct way to
enable panning across a virtual screen? Is there some documentation
I have missed?

ael