I've been experimenting with a clean installation of R5B7 on a spare drive and I've noticed that the audio levels of my PVR-350 and PVR-150 MCE are very different. The volume of the PVR-150 is much higher. I know there's a problem with the ivtv 0.4.3 driver and that the volume of the PVR-150 can't be changed using ivtvctl but I'm using ivtv 0.4.3 with my R5A26 installation and the audio levels of the two cards are much closer to each other. Did something change in MythTV?

I've used ivtvctl to check the volume while viewing live TV with each card in both installations and the volume always defaults to 58950. This makes sense since the volume for all my recording profiles is set to 90%. I can use ivtvctl to adjust the volume of the PVR-350 while watching TV. In R5B7, if I set it to the maximum (65535), it's just about the same level as the PVR-150 MCE.

Here's where it gets weird. If I adjust the volume of the recording profiles in MythTV to 100%, the volume of both cards increases, not just the PVR-350. I don't understand how this is possible if ivtvctl can't change the volume of the PVR-150.

Is there a more permanent way than ivtvctl that I can use to set the cards to the same approximate volume? The difference between the two cards is the only thing keeping me from upgrading to R5B7.

Yeah, this is a known issue. I wish we had a solution to give you, but I've got the same problem and no answer.

BTW - Where did you get the notion that ivtvctl can't be used to control the volume on a PVR-150? It's both wrong and sounds like a distortion of some of the other 150 issues (I beleive they were disabling VBI (Closed Captioning) on PVR-150's for some reason.)

I was mistaken about ivtvctl and the PVR-150. I assumed that when I used ivtvctl without specifying the device, it would change the volume for both cards. The PVR-350 is /dev/video0 so the volume was only changing for that one. I see now that it does indeed work for the PVR-150 as well. Thanks for setting me straight.

There are hacky ways to set the volume by using an external channel changing script that sets the appropriate values using ivtvctl after changing the channel using ivtv-tune. A search of the forums using those names should turn up examples I provided for someone else..