2013-04-07.

Time to look these things up a bit, instead of getting annoyed after
upgrades (e.g. OpenSuSE 12.2 --> 12.3 just recently, which meant no 
camera access, audio troubles, etc).


Camera (libgphoto): 
Instead of fooling around with guesses or coarse-grained access, run 
/usr/lib/libgphoto2/print-camera-list udev-rules  mode 0666  >/etc/udev/rules.d/90-libgphoto2.rules 

(based on http://forums.opensuse.org/english/get-technical-help-here/applications/457344-digikam-i-can-only-access-camera-root-user-opensuse-11-4-kde.html )


Audio:
Problem of users getting "dummy output" in their kmix.
Normal pulseaudio setup nowadays is user-level pulse daemon.
User thus needs soundcard access: add to audio group.
Doesn't seem important to be in pulse-access group: perhaps that's for 
when the daemon is a system-wide one.