[linux-dvb] Hauppauge HVR-1950 digital part

Yusik Kim yusikk at gmail.com
Sun Jul 27 04:37:34 CEST 2008


On Saturday 26 July 2008 18:33:47 Michael Krufky wrote:
> Yusik Kim wrote:
> > On Saturday 26 July 2008 13:40:36 Mike Isely wrote:
> >> On Sat, 26 Jul 2008, Yusik Kim wrote:
> >>> On Saturday 26 July 2008 08:39:16 Steven Toth wrote:
> >>>> Yusik Kim wrote:
> >>>>> Hi,
> >>>>>
> >>>>> Has anyone got the digital part of this device to work properly?
> >>>>>
> >>>>> Modules are compiled from the latest (7/26) v4l-dvb snapshot with a
> >>>>> 2.6.25.4 kernel. The modules seem to load properly and the analog
> >>>>> part works in mythtv. The digital part kind of works.
> >>>>> The problems I can observe are:
> >>>>> 1. Can only scan 3 digital channels using both the command line scan
> >>>>> and mythtv. My other PCI TV card scans 36 of them.
> >>>>> 2. Only occasionally locks in to a channel.
> >>>>> 3. Takes 5 minutes to lock in to a channel when it actually does
> >>>>> succeed.
> >>>>>
> >>>>> I saw from another mailing list that people were trying to get the
> >>>>> remote control to work so I'm guessing the core of the device
> >>>>> functions properly. If this is the current state of support, I'd be
> >>>>> glad to help testing.
> >>>>
> >>>> What steps did you take to prove your hardware is function properly,
> >>>> or your digital cable feed is reliable?
> >>>>
> >>>> The drivers works for me, it sounds like you have an environmental
> >>>> issue.
> >>>>
> >>>> - Steve
> >>>
> >>> Thank you for replying Steve.
> >>> I have a windows partition on the same machine and it works perfectly
> >>> there. So I don't think there is a problem with the cable feed or
> >>> hardware itself.
> >>>
> >>> Not sure if it has any relevance but I noticed in windows, the red LED
> >>> light in the front is always on whereas in linux, it only turns on
> >>> right before it tries to lock in to a channel.
> >>
> >> While I can't vouch for what the Windows driver is doing, the Linux
> >> driver (pvrusb2) for this device deliberately only lights the LED when
> >> actual streaming is being attempted.  Basically the LED becomes a "busy"
> >> indicator.  It's a feature not a bug :-)
> >>
> >>> I should add that the 3 channels that were successfully scaned do not
> >>> always get picked up in subsequent attempts. It seems like it has
> >>> trouble tuning. At least it's good to know it's a problem on my end.
> >>> Just have to find a way to fix it.
> >>
> >> Sounds a lot like there's a significant tuning problem.  Unfortunately
> >> I'm not seeing the issue here :-(
> >>
> >>   -Mike
> >
> > Thanks Mike.
> > Nobody else seems to have the same problem. What's driving me crazy is
> > that I have 2 laptops where I can test (c2d 1.06GHz/ Pentium-M
> > 1.4GHz(backend only);both Debian testing) and both have the exact same
> > problem so it's most likely not machine specific. It works on a windows
> > partition of the c2d machine so it's not hardware related nor is it
> > because of a bad signal source.  So the only thing that stands between me
> > and all the other people who are happily using it can be narrowed down to
> > kernel options or the distro.  Are there any known kernel options/modules
> > that may interfere with the tuning?
> >
> > Another interesting thing is that in mythtv-setup, I have no option to
> > choose ATSC. Only NTSC, NTSC-JP, SECAM, etc. but no ATSC. It doesn't even
> > allow me the option to manually create an ATSC channel. The only way I
> > get an ATSC channel is through active scan (which most of the time
> > doesn't work). I can select ATSC on my desktop with a pci capture card. I
> > can't use the desktop to test it because it's USB1.1.
> >
> > It looks like a dead end for now. Thanks to everyone who tried to help.
>
> To use ATSC in mythtv, set the device up as a DVB device, not a video4linux
> device.  You set up two devices, one video4linux for the analog encoding,
> the other "DVB" for ATSC.
My device is set up as DVB (s5h1411/ATSC). In fact, I don't have the analog 
tuner set up since I know it is working. What I am saying is that in 
mythtv-setup -> General -> Locale Settings -> TV Format
I don't have an option to choose ATSC where my other pci tuner does give me 
that option. Also when I try to manually create a new channel from the 
channel editor there is no ATSC option for the "tv format" but the 
pre-scanned channels do display  "ATSC". I didn't know if this was normal 
behavior. 

Probably no one will be interested at this point but I also noticed after 
taking 5 minutes to lock to a signal, it can quickly lock to the channels 
that are near by (e.g. 7_1, 7_2, 7_3) but when changing the channel to 
something like 9_1, it takes another 5 minutes to lock to it. 

>
> I also suggest that you try adding a signal amplifier and see if that helps
> the reception.
My antenna is the type that has a small built in amplifier but I'll try it out 
at a friend's house with cable.

Thanks!

>
> Regards,
>
> Mike





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