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Full duplex issues

I would like this FAQ covers full duplex related issues. For example, it would nice to have some general guidelines to know the audio hardware capabilities of a system, such as checking the contents of:

/dev/sndstat /proc/asound/*

-- RafaelVarela 2010-12-09 11:11:48

Adding user to audio group as solution

I asked at the pulseaudio list when pulseaudio was not working and got the following answer

That is very much the wrong way to fix this issue properly and the wiki page you link is very wrong to suggest this as a fix.

The correct approach is to ensure the appropriate ACLs are written to the device nodes for the active user. This is done automatically by console-kit and udev integration (provided you don't mess up all the upstream rules of course)

By adding users to the audio group, you fundamentally break multi-user systems as both users will be able to use the sound device at the same time.

I'd appreciate it if you could update the wiki to advise against adding users to the audio group and seek to fix the ACL problem your distro is experiencing.

OSS as open source

SoundFAQ features some obsolete info. For example:

A: There is also a commercial product called OSS/Linux (Open Sound System for Linux), a closed-source alternative OSS implementation for Linux by 4Front Technologies. It is nonfree/non-gratis. It however can auto-detect cards, supports some more hardware and features, and there is a nice user interface.

OSS4 is open sourced since 2007 and can be installed in Debian with a kernel module compilation. See details for example here: