[mythtv-users] Upgrade old or cut my losses and buy new?

Yan Seiner yan at seiner.com
Wed Mar 7 21:50:55 UTC 2007

Yan Seiner wrote:
> The non-working machine, the one with the Sempron, locks up when trying 
> to use agpgart; I have to set option "nvagp" "0" or "1".
> On looking at the modules, the working machine loads the agpgart and the 
> via_agp modules; it has a KT400 chipset.
> The non-working machine loads agpgart and amd64_agp.  The kernel docs 
> say:  
> This option gives you AGP support for the GLX component of X using the 
> on-CPU northbridge of the AMD Athlon64/Opteron CPUs.  You still need an 
> external AGP bridge like the AMD 8151, VIA K8T400M, SiS755.
> So.... First of all, do Semprons have an on-CPU northbridge?  Second of 
> all, should I be loading the via_agp module as well?
> Or should I be loading *just* the via_agp?
OK, a bit of testing last night and some changes (not really improvement...)

If I load the amd64_apg module, I get a hard lock on trying to use AGP 
(nvagp = "2|3").  If I leave that module out, or load the via_agp 
module, I get agp usage, and the stuttering is gone.

Unfortunately, the video runs in slow motion for a second or two, then 
breaks up slightly, gets caught up, runs in slow motion....

One other thing I've noticed is that my logfile shows an agp aperature 
of 32 MB even though I have the bios configured for 64 (or 128 or256) 
MB.  Are there any known problems with the Asus K8V SE mobo or the 
K8T800 chipset?

More and more it feels like a problem with the CPU <-> AGP data flow....


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