Public bug reported:
Binary package hint: xserver-xorg-video-ati
Using EXA RENDER acceleration in the open source radeon driver, on an rv250
(Mobility 9000), certain transparency elements will get artifacts along the
border of the "canvas", for lack of a better word. It's not the border of the
actual image, but the border of the entire canvas, i.e. a 32x32 image, of which
the non-transparent image is only the center 16x16 square, the artifact would
be along the "invisible" 32x32 edges.
The artifacts are consistent, in that it's always the same elements that have
the problem.
Ubuntu Hardy Heron, 8.04
Xserver 1.4, Xorg 7.3
xserver-xorg-video-ati 6.8
The problem has existed since accelerated RENDER has been implemented.
Still persists, even in the newer Intrepid Ibex 8.10 xserver and ati
drivers.
Setting RenderAccel to false, or MigrationHeuristic to greedy makes the
problem disappear, as this disables RENDER acceleration.
It doesn't seem to affect transparency that's generated by the
compositor, but by transparency that's specified by an image.
Most definitely an upstream bug, but I don't know where to report it.
** Affects: xserver-xorg-video-ati (Ubuntu)
Importance: Undecided
Status: New
** Description changed:
Binary package hint: xserver-xorg-video-ati
- Using EXA RENDER acceleration in the open source radeon driver, on an rv250
(Mobility 9000), certain transparency elements will get artifacts along the
border of the canvas, for lack of a better word. It's not the border of the
actual image, but the border of the entire canvas, i.e. a 32x32 image, of which
the non-transparent image is only the center 16x16 square, the artifact would
be along the "invisible" 32x32 edges.
+ Using EXA RENDER acceleration in the open source radeon driver, on an rv250
(Mobility 9000), certain transparency elements will get artifacts along the
border of the "canvas", for lack of a better word. It's not the border of the
actual image, but the border of the entire canvas, i.e. a 32x32 image, of which
the non-transparent image is only the center 16x16 square, the artifact would
be along the "invisible" 32x32 edges.
The artifacts are consistent, in that it's always the same elements that have
the problem.
Ubuntu Hardy Heron, 8.04
Xserver 1.4, Xorg 7.3
xserver-xorg-video-ati 6.8
The problem has existed since accelerated RENDER has been implemented.
Still persists, even in the newer Intrepid Ibex 8.10 xserver and ati
drivers.
Setting RenderAccel to false, or MigrationHeuristic to greedy makes the
problem disappear, as this disables RENDER acceleration.
It doesn't seem to affect transparency that's generated by the
compositor, but by transparency that's specified by an image.
+
+ Most definitely an upstream bug, but I don't know where to report it.
--
[RADEON] exa acclerated transparecy artifacts at canvas border
https://bugs.launchpad.net/bugs/270690
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