On Thursday 02 March 2006 12:46, Pontus Frendin wrote:
> Hi all!
>
> I have already posted this question once but since there were no
> replies I'll give it another try. It's not my meaning to spam the
> list but I really would love to solve this problem and believe that
> others could be interested in any possible answers. Here goes
> nothing...
>
> As soon as I start to capture TV-signals with my Hauppauge PVR-500
> the computer crashes. I have tried a number of distros (Ubuntu
> Breezy, OpenSuse 10 and Fedora Core4) but the problem remains in all
> of them.
>
> At initiation of the IVTV driver my log says "Unreasonably low
> latency timer, setting to 64 (was 32)". The thing is that I'm unable
> to capture any tv (or radio) with my PVR-500 if the latency timer is
> higer than 32. I have found this out by playing around with the PCI
> Latency Tool ( http://downloads.guru3d.com/download.php?det=951) in
> Windows XP. If the latency timer is > 32 the computer freezes as soon
> I start the capturing.
>
> This is my system setup:
> ABIT AV8-3rd Eye (VIA K8T800 Pro/VT8237)
> AMD Athlon 64 3500+
> Hauppauge PVR-500 MCE
> Inno3d, NVIDIA GeForce 6200, 128 MB
> Gail 2*512 MB
>
> I'm starting to think that the crashes has to do with the combination
> of the PVR-500 card and my ABIT AV8-3rd eye motherboard. Apperently
> there is a known problem with PVR-500 + ASUS A8V-Deluxe and just like
> my motherboard the ASUS board is based on the VIA K8T800 Pro chipset.
>
> Is there any way to tell IVTV not to change the latency timer
> (preferably without manipulating source code)?
If you can demonstrate that ivtv works for you after changing the source
not to set the latency to 64, then I'm happy to add a module option for
that. At this moment you have to change the source. It's the first time
that I've heard of a problem like this, though.
> Will the driver not
> work with latency timer < 64?
I think it will work, but it may increase the chance of DMA problems. It
might even be no longer necessary anymore. It's been in the driver for
a long time, but the DMA implementation in the driver has been much
improved since.
Hans
>
> Why does IVTV want to change the latency timer? Could you give a
> explanation to what a higher latency timer improves?
>
> Is there perhaps some other way to solve my capturing problems
> without lowering the latency timer?
>
> All sugestions are warmly welcome, I'm getting desperate here!
> //Pontus
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