Bug#575348: xrandr --scale no longer works

[spikethehobbitmage.excite]

Package: xserver-xorg-video-radeon
Version: 1:6.12.162-2

After upgrading kernel and radeon driver, xrandr --scale no longer works.
Instead of scaling screen output, display is corrupted.
There is additional incorrect behaviour if compositing is enabled.

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Kernel: linux-image-2.6.33-2-amd64
Version: 2.6.33-1~experimental.4
KMS enabled with radeon driver
both free and non-free firmware is present

KDE 4.3.4
x11-xserver-utils version:  7.5+1

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Previous versions:
radeon 1:6.12.99+git20100201.a887818f-1
kernel 2.6.33-1~experimental.3

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To reproduce:
xrandr --output DVI-0 --scale .5x.5

Actual behaviour:
The desktop is reduced to 1/2 its original size, however the window manager does not seem to be notified.  Mouse movement is restricted to the new size.
No scaling of output image occurs, so right and bottom 1/2 of screen are blank.

If compositing is enabled:
Window contents are no longer updated unless a redraw is forced.
A strip across the top of the desktop no longer renders (old content remains).  Mouse displays correctly in this area.
A smaller strip across the top of all windows is no longer rendered at all.

Expected behaviour:
The image on the monitor should be scaled (expanded) without changing the screen mode.
The underlying desktop should not be affected.

Note: I may be incorrect about the desktop not being resized as that has always been offscreen before, however the mouse was still able to enter that area.  This is no longer the case.

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Running xrandr --output DVI-0 --scale 1x1 restores normal state.

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I do not believe xrandr is at fault as it was not upgraded, and it worked before.


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