KDE isn't using entire virtual desktop

On an 11.1 AMD64 system with nvidia 6150 (binary driver) and 15" CRT
using and X using 1024x768 resolution, it works as expected. I added
“Virtual 1400 900” to the default screen subsections in xorg.conf like I
always do, and the virtual display works and scrolls at the boundaries,
but even though I can scroll around the entire 1400x900 desktop area it
seems that KDE doesn’t recognize the full desktop dimensions and thinks
it only has 1024x768.

The panel is drawn as if the desktop was only 1024x768, and windows
maximize as if the desktop was only 1024x786. If I scroll the virtual
desktop fully to the upper left, it’s just like having a 1024x768 KDE
desktop. I can’t drag anything past that boundary, it acts like it’s
dragged off the screen although the background image (wallpaper) is
there and the display scrolls.

This is the first time I’ve used KDE4 and don’t see anywhere to set KDE
to use the entire virtual desktop space. KDE3 just always used the
entire space by default. The xrandrtray app changes between all the
resolutions fine as well, but the area that KDE uses for the desktop is
always pinned to 1024x768 regardless of the virtual resolution.

What do I need to do to get KDE to use the entire virtual desktop
resolution provided by the X server? Is there somewhere I need to set
the KDE desktop size to match the resolution of the X virtual display?
Any ideas?


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