I've just started (within the last week) having audio problems.  I'm 
using the ivtv drivers bundled with the kernel version 2.6.24 (gentoo 
-r3).  I've never had this problem before, and right now it is intermittent.

The problem is distortion in the audio - as if the gain were too high. 
I've confirmed that the input signal to the card is clean.  Adjusting 
the gain doesn't seem to help (configured using the MythTV recording 
profiles settings).

However, I've found something that fixes the problem (temporarily):

# v4l2-ctl -d /dev/mythvid/PVR500-1 --get-audio-input
Audio input : 1 (Line In 1)

# v4l2-ctl -d /dev/mythvid/PVR500-1 --set-audio-input 1
Audio input set to 1

Nothing has changed (in theory), but the audio immediately clears up. 
This suggests that this is a driver problem of some kind.  Has anybody 
seen anything like this?

I have not touched mythtv for several weeks - the problem is definitely 
more recent than my last upgrade to the recording software.

I guess in the worst case I can just make a 1-minute cron job that just 
keeps resetting the audio inputs, but is there a solution for this?

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