> > 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.
I commented out the if clause on line 911 in ivtv-driver.c like this:
/*
Removed the following if clause due to problems with capturing
when latency timer > 32
if (pci_latency < 64) {
IVTV_INFO("Unreasonably low latency timer, "
"setting to 64 (was %d)\n", pci_latency);
pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64);
pci_read_config_byte(dev, PCI_LATENCY_TIMER, &pci_latency);
}
*/
...and presto! It seems like it did the trick. At least I'm now able
to capture video with both my tuners without causing computer crashes.
I have not yet done any extensive tests but at a first glance
everything looks fine. Perhaps I will run in to some problems later
due to the relative low latency timer setting (lets hope not) and
there might be some other/better solution but I'll give this a shoot.
I have read other forums where people with problems similar to mine
(but in a Windows environment) have been sugested to lower the latency
timer. As mentioned in my original post there seems to be some problem
with the PVR-500 and certain VIA based motherboards. I do not know how
common it is but there could be others interested in the possibility
to freely choose latency timer settings without intervention from the
IVTV driver?
Now I'm of to installing MythTV. Wish me luck! :-)
Thanks for the help!
/Pontus
_______________________________________________
ivtv-users mailing list
[email protected]
http://ivtvdriver.org/mailman/listinfo/ivtv-users
