walt wrote:

> Fresh gentoo install on new lenovo desktop.  Both linux and win7
> (lenovo installed) tell me that this machine has two audio devices:
> 
> 00:01.1 Audio device: Advanced Micro Devices [AMD] nee ATI BeaverCreek
> HDMI Audio [Radeon HD 6500D and 6400G-6600G series] Subsystem: Lenovo
> Device 3625 Kernel driver in use: snd_hda_intel
> Kernel modules: snd-hda-intel

That's the HDMI output of your integrated GPU. All AMD graphics, 
including the APU you have, come with integrated HDMI Audio. 

> 00:14.2 Audio device: Advanced Micro Devices [AMD] Hudson Azalia
> Controller (rev 01) Subsystem: Lenovo Device 3625
> Kernel driver in use: snd_hda_intel
> Kernel modules: snd-hda-intel

This is the one you have to use for laptop audio.

> I spent an entire frustrating day discovering that the reason I
> have no sound is that every app wants to use /dev/mixer when only
> /dev/mixer1 actually works :(
> 
> Only some apps (like audacious) will let me choose which mixer to
> use, and those apps work perfectly.

> Anyone else seen this before, I hope?  Got a fix?

I think you have to make the second one the default audio device. 
Possibly by editing the alsa.conf files found in /etc/modprobe.d and 
/usr/share/alsa. This thread may help :
http://www.linuxquestions.org/questions/gentoo-87/set-default-sound-
card-796566/

HTH


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