Re: DRM/DRI accelerated (3D) graphics?

[A Devine <devine@dna.ie>]

Hi Emeric,

Thanks again for the troubleshooting and patches. I applied your patch 
to my Gentoo (just trying it out I swear!) 2.6.39 system, compiled with 
KMS on by default on my zx6000 / RV610 (Radeon HD2400) system. I was 
greeted by a black (dead) screen in the text console and a gray non 
response screen in X.  However a little more research and I found I was 
missing the Radeon firmware for my card, got that installed and its 
working!  Accelerated Desktop, let alone 3D is so much nicer looking and 
much faster!

I did notice this error in dmesg, but its still working fine as above:

[drm:radeon_agp_init] *ERROR* Unable to acquire AGP: -19
[drm] Forcing AGP to PCIE mode

I put in a module option in the radeon-kms.conf file to force AGP to 4x 
and it didnt seem to make any difference. I dont know if this is 
affecting the system in a negative way anyhow, though my HD2400 only 
manages 500fps in glxgears. I did have a R300 card but I think its 
physically broken (zx6000 does the beeping and all lights flashing error 
frequently with it in).

Food for thought anyhow!


Alan


 On 23/08/11 21:14, Émeric Maschino wrote:
> Hi,
>
> > Huh, I just forgot about an important thing in my previous message!
> >
> > KMS, even with current kernel, still complains about AGP bind memory
> > problem. (As a result?) GPU acceleration is disabled and AGP mode
> > forced to PCI.
> >
> > This issue has been fixed in agp/amd-k7 for the AMD platform. I've
> > simply adapted this patch for the zx1-derivatives and the problem
> > seems to go away (see
> > http://marc.info/?l=linux-ia64&m=130263778331960&w=2 for details). I
> > never got any feedback on this patch port, so I don't know (i) if it's
> > correct and (ii) if it really enables back GPU acceleration or simply
> > get rid off the error messages! Indeed, with or without this patch
> > applied to kernel source, glxgears still reports extremely low ~85 FPS
> > with r300g.
> Great news! I just repost the above patch
> (http://marc.info/?l=linux-ia64&m=131412890819311&w=2) and it should
> be merged into mainstream by Tony Luck.
>
> I forgot (once again!) one important thing: I was running glxgears
> synchronized to the vertical refresh, hence the mere 85 FPS in
> average. Running glxgears not synchronized to the screen refresh, I'm
> now getting 1700 FPS! With such "high" framerate, GPU acceleration is
> probably running fine :-)
>
> Cheers,
>
>      Émeric