Render Accel with Radeons

Alex Deucher alexdeucher at
Sun Sep 19 09:31:32 PDT 2004

On Sun, 19 Sep 2004 18:50:32 +0530, Ayan Chakrabarti
<ayan.chakrabarti at> wrote:
> Hi,
> I've just downloaded and compiled 6.8.1 (with GCC-3.4.1 if that's any
> help). Anyway, I have a Radeon 7000 (VY) (i believe it falls under the rv100
> category of ati chips). Now I have dri and everything working, but alpha
> blending is not accelerated at all.
> I've basically enabled composite and am using xcompmgr and transset to get my
> windows to look translucent. I've enabled "Render Accel" in my devices section
> but there doesn't seem to be significant improvement, while setting the same
> option on an nvidia system (in the very next room !) really reduces
> the render time.
> I'd like to say here that normal open gl is working fine (with infact
> significant improvement in the FPS rate in games from XFree86 4.4). I'm using
> the radeon drm modules that are included in the linux kernel (version
> I'm not sure if this is a bug, an absent feature or a goof-up on my part in
> the configuration. That's why I'm sending this mail. I'd be really grateful if
> someone could help.

The current render accel for radeon really only speeds up AA text. 
for full blending and transforms we really need to use GL or a new
accel architeccture like KAA.


> Thanks,
> Ayan Chakrabarti
> PS - If this is an absent feature, does that mean I've to wait till
> 2005 (the next proposed release date) to get this working on my
> computer ?!
> _______________________________________________
> xorg mailing list
> xorg at

More information about the xorg mailing list