Hello,
I've launched it from command line :
planeshift
DEBUG: Sound System Software Renderer Initializing...
ATTENTION: default value of option force_s3tc_enable overridden by environment.
libGL warning: 3D driver claims to not support visual 0x5b
ALSA lib pcm.c:2145:(snd_pcm_open_noupdate) Unknown PCM default
I suppose that's sufficient. The sound card is integrated on motherboard Realtek ALC880.
And the sound is OK on the Web, for videos, music and so on... (Even Skype)
Thanks for help,
Harfango