[Bug 31799] xrandr transform not supported?

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=31799

--- Comment #2 from Thomas Orgis <sobukus at sourcemage.org> 2010-12-01 12:47:40 PST ---
Well then, this is confusing. That change in r600_exa.c does not change
anything in the behaviour I observe. Fact is, that

xrandr --output VGA-0 --rotate inverted

does work properly, while

xrandr --output VGA-0 --fb 1024x768 --transform 1.5,0,-280,0,1.5,0,0,0,1

does exactly nothing with the screen configuration. So we have to assume that
somehow the Xorg in ubuntu is broken? Can you confirm that such a more
elaborate transformation does work on r600? My actual intention was to use this
for more fancy matrices like

xrandr --output VGA-0 --fb 1024x768 --transform
1.5,-0.005,-280,0,1.5,0,0,-0.00005,1

...which does scale down and applies keystone correction. Well, this stuff does
work with the fglrx driver, though I observed nasty interpolation quality -- it
looks better on the intel-powered laptop, by far.

Anyhow: If you can confirm that this is working with your setup, then this bug
can be closed, the issue blamed on ubuntu. I will resort now to using the PCI
Matrox G450 card for movies and scale down the image via non-fullscreen
playback; live with the slight keystone effect and rather enjoy the tear-free
video experience that sadly cannot be matched by either radeon driver since the
introducton of textured video...

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