On Sunday 10 September 2006 19:40, Simon John wrote:
> After trying to get my PVR250 card working with ivtv for what must be
> the best part of a year on two machines (Fedora 4 and now 5) through
> the tuner, and giving up, I've now decided to make it simpler and use
> the SVHS input from my Sky box.
>
> I followed the howto, using ATRPMs-stable, ivtv 0.7.0, the char-major
> stuff in /etc/modprobe.conf, kernel 2.6.17-1.2174 and now find that I
> can capture sometimes (to file or mplayer), but mostly get hundreds
> of the following from dmesg:
>
> ivtv0 warning: IRQ: IVTV_IRQ_DEC_DMA_ERR
> ivtv0 warning: invalid api mailbox
>
> When I try to capture, the capture fails (cats a zero byte file or
> doesn't load mplayer) and I cannot kill the process. Any ivtvctl
> commands then take about 10secs to complete.
>
> I've tried the noapic kernel param and modprobe'ing in different
> orders, but nothing works. How do you turn on debugging?
>
> This is a KT266 motherboard, which I think may have issues with DMA
> on Linux, although nothing else (SATA, 1394, USB2, IDE, gigabit....)
> suffers, it does seem to be sharing IRQ11.
I have a very similar PVR250 card which works great. But you mention the
KT266 chipset: I think that is one of the 'bad' chipsets that simply do
not work well (or at all) with the PVR cards. Windows also has issues
AFAIK. Try the card in another PC with a different chipset (preferably
non-VIA chipset or a modern one (e.g. no older than 2 years I think).
> lspci -v gives:
>
> 00:0a.0 Multimedia video controller: Internext Compression Inc iTVC15
> MPEG-2 Encoder (rev 01)
> Subsystem: Hauppauge computer works Inc. WinTV PVR-250
> Flags: medium devsel, IRQ 11
> Memory at d8000000 (32-bit, prefetchable) [disabled]
> [size=64M] Capabilities: [44] Power Management version 2
>
> I hate to say it, but the same card has worked fine for years in two
> PCs using WinXP, and the output quality seemed to be much better - I
> expect the Windows drivers used some proprietary interlacing like the
> Philips WebCams.....?
As far as I know there is no quality difference between Windows and
Linux drivers for this card. The sole exception were problems with
certain Samsung tuners that are solved by now.
Hans
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