On 12/26/2004 01:21 PM, Gary Cote wrote:
I'm trying to setup a mythtv system (my first, so I'm a bit of a newbie), but am having problems tuning channels. I can only tune in two channels cleanly. I just get grey & white snow on the others.
On the good channels, ivtvctl -I reports: check SAA7115 input signal ioctl: VIDEO_STATUS = Sat/Dvd
On the bad channels, ivtvctl -I reports: check SAA7115 input signal ioctl: VIDEO_STATUS = Bad
I'd appreciate answers to the following questions, and any other suggestions people might have. See below for system info.
Thanks in advance
- gary
-------
1. Is it likely that I just have to amplify the signal? I live in an apartment complex, so there's no telling how clean the signal is.
Possible.
But does the fact that I can tune two channels indicate anything?
No. Different channels usually have different signal strengths on cable.
In an attempt
to gather another data point, I hooked a rabbit ear
antenna up to it. I could tune in a couple different
stations. This would tend to indicate to me that it's
the signal that's the problem, rather than the tuner.
Possibly. Could also be other things.
Again, I'm in an apartment, so the best I could do isIt could help amplify the noise for you--just in case you're having trouble seeing the noise. ;)
amplify the signal at the wall jack. Would that do me
any good?
2. There are lots of examples of people setting various options (especially tuner type) in their modprobe.conf or modules.conf. My understanding is that recent drivers autodetect pretty much everything that's significant. Is that correct?
*YES*
Or should I be tweaking something there?
*Definitely* *NOT*. :)
Implement the communications with the card. (The CODEC (=COder/DECoder) is actually programmed in firmware and implemented by the hardware.)3. I thought about trying more recent drivers, but wasn't sure exactly what to update. Do I understand correctly that the ivtv drivers just implement the codec
, and that the tuner (saa7115, saa7127 in my case?) are bundled with the kernel?
Correct.
Since the codec seems to be working,
upgrading ivtv wouldn't seem to be the solution.
Correct.
...The Linux 2.6.9 kernel has a bad definition for the LG TAPE tuner (type 47). Depending on the exact commands you issued to install ivtv, you may have updated the tuner module to the appropriate one. Unfortunately, it's not too easy to test.
Dec 26 08:55:12 myth kernel: ivtv: Linux version: 2.6.9-1.681_FC3 686
REGPARM 4KSTACKS gcc-3.4
...
Dec 26 08:55:12 myth kernel: tveeprom: tuner = LG NTSC (TAPE series) (idx =
68, type = 47)
The easiest solution is to upgrade to Linux 2.6.10 (which contains a working definition for your tuner). If you can't do that, it's possible that you a) do not have the video4linux snapshot package that contains the updated tuner module, b) have the updated tuner module, but have a bad (old?) module-init-tools package which causes the old tuner module to load, or c) have a working tuner module and module-init-tools and have a configuration problem. Upgrading to 2.6.10 should take care of cases a) and b), giving us a much better starting place for diagnosing the problem.
HTH. Mike
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