[linux-dvb] KWorld Digital DVB-S 100 - Locking Problems

James Buckley xanium4332 at googlemail.com
Wed Jun 20 01:17:21 CEST 2007


Hi all, haven't been following the list for the past 2 weeks, been a bit
busy, however I have a problem...

*If you don't feel like reading my monologue, skip to the bullet points*

I bought a KWorld Digital DVB-S 100 PCI card as a replacement for my POS
DVB-T card. I checked to see if it's supported, it was, and nobody was
reporting any real problems, so I went ahead and bought one.

Anyway, things were going pretty smooth (card detection went fine, drivers
were fine (well I'll correct that in a minute :), scanning for channels went
fine), until it came to the point of actually *watching* TV, the card just
won't lock successfully. I'm in the UK and have had SKY for a while. So I
know my dish alignment and etc.. are fine (had sky for over 3 years, never
had a hiccup in the signal, and the digibox reports '60%' for both signal
strength and signal/noise ratio)

I'm using MythTV (surprise), and the card gets a 'partial' lock (L_S is
what's reported by myth), but the signal strength info seems a bit off the
wall (97% strength, 4.8dB signal/noise). Scanning for the channels went
fine, it found pretty much everything (although a lot is encrypted, but I'm
only worried in the FTA stuff anyway).

I read a post somewhere saying that something changed between kernel's
2.6.17 and 2.6.18, stopping the card from locking unless there was excellent
signal strength. I'm running ubuntu 7.04, so the kernel's well past 2.6.18.

*End Monologue*

Tuning fails (Myth L_S partial lock):
1. Can't be the dish setup, Sky's been fine for years
2. Could be my configuration, but doubt it (myth's pretty easy to setup)
3. Channel scanning works fine, so the card's definitely getting reception
4. Read some some other post about a change between kernel's 2.6.17/2.6.18,
something about only getting lock with strong signals, but was fine before
2.6.18
5. Running Ubuntu 7.04 - Drivers seem fine

I was wondering whether anybody had some info on this, e.g. whether it's a
known issue, is there a flag I just need to set, anything would be good :P

Thanks in advance, James Buckley
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