[ivtv-users] CX18 audio interference

[Andy Walls]

On Fri, 2009-05-01 at 21:41 -0400, faginbagin wrote:

> > # v4l2-dbg -d /dev/video0 -c host1 -s 0x104 0x07005d80
> > Register 0x00000104 set to 0x7005d80
> 
> My output:
> Register 0x00000104 set to 0x7005d80
> 
> > The cx18 driver is currently setting the AGC for the SIF audio input
> > amplifier to set the SIF input amplifier gain based on video signal
> > level.  This register change (which is tailored for an HVR-1600 set to
> > the analog tuner) sets the AGC for the SIF audio input amplifier to be
> > controlled by the audio signal level.
> > 
> > Hopefully that will make things better.
> 
> Yes, it seems to do the trick! 

Good!

Now I have lots of confusing code borrowed from the cx25840 module to
straighten up. Ugh!  Don't look for a patch worth testing until next
weekend.


> I also tuned a handful of other troublesome channels and they sound
> good too. Hopefully it will survive when I start mythbackend. I've got
> a recording scheduled at 10pm and I'll be sure to check it soon after
> it starts.

It should persist until you switch analog input sources: radio, svideo,
or composite.  When you go back to tuner after that, the driver will
write bad values back in.

Regards,
Andy


> Thanks,
> Helen