Internal and s-video tuner problem

[Chapon]

I Have an ATI 550 on wich I have set the internal tuner for analog tv and an S-video external tv capture source hooked to my STB. Schedule direct puts all analog and digital channels right in my TV guide. I can record either on the analog or the s-video source with clean channel selection on this one.

The only problem I have is when I tune to a digital channel in live tv: the right channel number an EPG info appears, but no signal, only snow an white noise.

But if I start recording on one of the digital channels, I can watch the program as if I was in timeshift. But I would evidently prefer not to have to use this workaround

Any advice?

Thank you

[sub]

Reproduce the problem, then zip and attach the logs and I'll take a look.