I have a monitor that rotates, and tried rotating the display via Settings / System Settings / Display and Monitor / Size and Orientation.

The problem is that when I do this, I somehow get a virtual desktop (which is not there when the monitor is in landscape mode), so that every time the mouse goes to the right edge of the screen, all of the windows scroll off the left of the screen. How do I restrict the virtual desktop size to the actual screen size?

I'm not entirely sure about what you setup in the krandr GUI or whether this is a bug in krandr, but run

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xrandr -q

to determine your setup, next

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xrandr --output DVI-I-1 --auto

to gain back your default setup and last

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xrandr --output DVI-I-1 --rotate left

to rotate the screen 90° to the left (that is correct if you rotate your display panel clockwise)

"DVI-I-1" should be the device you figured with the initial "xrandr -q" call

-> if he issue still remains, there's a bug in libXrandr, if not, there's either a bug in krandr or your setup is just wrong and implies that panning.

That worked! Thank you.

Just for the record (it does seem there is a bug somewhere):

With the monitor in normal (landscape) mode:

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$ xrandr -q
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 8192 x 8192
DVI-I-0 disconnected (normal left inverted right x axis y axis)
VGA-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 531mm x 299mm
   1920x1080      60.0*+
   1280x1024      75.0     60.0
   1152x864       75.0
   1024x768       75.0     60.0
   800x600        75.0     60.3
   640x480        75.0     59.9
HDMI-0 disconnected (normal left inverted right x axis y axis)


After using Settings / System Settings / Display and Monitor / Size and Orientation to rotate the display, I get (note 1920 x 1920 instead of 1080 x 1920):

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$ xrandr -q
Screen 0: minimum 8 x 8, current 1920 x 1920, maximum 8192 x 8192
DVI-I-0 disconnected (normal left inverted right x axis y axis)
VGA-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 connected 1080x1920+0+0 left (normal left inverted right x axis y axis) 531mm x 299mm
   1920x1080      60.0*+
   1280x1024      75.0     60.0
   1152x864       75.0
   1024x768       75.0     60.0
   800x600        75.0     60.3
   640x480        75.0     59.9
HDMI-0 disconnected (normal left inverted right x axis y axis)


But then:

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$ xrandr --output DVI-I-1 --auto
$ xrandr -q
Screen 0: minimum 8 x 8, current 1080 x 1920, maximum 8192 x 8192
DVI-I-0 disconnected (normal left inverted right x axis y axis)
VGA-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 connected 1080x1920+0+0 left (normal left inverted right x axis y axis) 531mm x 299mm
   1920x1080      60.0*+
   1280x1024      75.0     60.0
   1152x864       75.0
   1024x768       75.0     60.0
   800x600        75.0     60.3
   640x480        75.0     59.9
HDMI-0 disconnected (normal left inverted right x axis y axis)


Now it correctly shows 1080 x 1920 (the virtual desktop is the same as the screen size). I am guessing this is a bug in krandr. I am using kde 4.9.5.

Yes, is.
https://bugs.kde.org/show_bug.cgi?id=317435