Bug 26735

I have tested the open source radeon drivers on my ATI Radeon HD4650.
First of all many thanks for the work on this driver, KMS works like a charm [1], and no 3D app has crashed (fglrx tends to deadlock lately).

Now to some rendering artifacts I noticed in blender (and some games, like Heroes of Newerth beta).

To reproduce on Debian unstable x86-64:
1. Install blender 2.49.2 (apt-get install blender)
2. Open the attached test.blend
3. Switch to textured mode (press ALT-Z)
4. There are 3 noticable artifacts here (see screenshot1_r600 attached):
 - the floor tiles at the bottom have an L shaped whiteish stain on them, that shouldn't be there
 - the spotlight has black stripes, instead of just lighting an area
 - the blender interface has a black/grey thing at the bottom that it shouldn't

5. Press P to start the game engine
6. Move the mouse around to move the spotlight. See the black stripes moving along with it, there shouldn't be any black stripes at all!
See screenshot2_r600 vs screenshot2_swref

To get the reference renders you can either use fglrx, or Mesa's software mode
(which will be very slow, but will get nice renders). These images aren't perfect either (there is some aliasing), but much better than the r600 ones:
LIBGL_ALWAYS_SOFTWARE=1 blender

System info:
$ glxinfo|grep OpenGL
OpenGL vendor string: Advanced Micro Devices, Inc.
OpenGL renderer string: Mesa DRI R600 (RV730 9498) 20090101  TCL DRI2
OpenGL version string: 2.1 Mesa 7.8-devel
OpenGL shading language version string: 1.20
OpenGL extensions:

Linux 2.6.33-rc8-00189-g9f3a628 (compiled by me, .config attached)
mesa from git (compiled by me, mesa_7_6_1_rc1-5145-g2f5beb4)
with this patch applied:
 http://cgit.freedesktop.org/~andrem/mesa/commit/?h=r600- test&id=6ee755760d124c85bdfd121fd491f68fccca84f7

From Debian unstable/experimental packages:
Xorg 7.5
xserver-xorg-video-radeon 6.12.99+git20100201.a887818f-1
libdrm1-radeon, libdrm2: 2.4.18-2
libgl1-mesa-dri: 7.7-3 (but see below, I used my own build instead)

If you need more info, just ask.

[1] I had to download&copy R700_rlc.bin to the proper place, and thanks to some help on #radeon fix a missing libdri.so, but everything else worked