Trust USB Audio - volume control has no effect

[Tweenk]

Hello

I have a problem with an external Trust USB Audio card. The card worked perfectly in the pre-PA world, but now the volume control doesn't work, it has absolutely zero effect. It turns out that there are two channels named "speaker", but only one of them affects the output level, and PA adjusts the wrong one.

It seems that the problem of weird mixer controls is rather prevalent. I experienced a similar problem with my internal sound card (where Master doesn't affect Headphone) but was told it was an ALSA problem.

[Tweenk]

Output of lsusb -v for the card

[Tweenk]

Output of amixer for the card

[Tweenk]

By the way this is on PulseAudio 0.9.18, Ubuntu Karmic.

[lennart]

Hmm, this really looks as if the driver is mislabelling things in a way it should not do it. Please file a bug against the driver and ask for fixing this, possibly adding quirks to the driver.

[Tweenk]

Could you at least consider some stopgap measure for those "broken" cards? Both of my devices have a "broken" mixer (both my tablet's internal card and this external card doesn't behave correctly with the volume control).

[lennart]

What you can do is load module-alsa-sink manually and use the control= argument to set the mixer control to the one you want pa to use. You can just edit default.pa to add "load-module modula-alsa-sink device_id=Intel control=Master" or so for this. And make sure to set the autodetected card's profile to "off" before you do this, so that the two module instances don't start to fight with each other.h