Hi, I installed ALSA driver and library insted of OSS to my target ARM board. After USB headset is inserted, sndinfo shows 'No devices found', although aplay(ALSA util program) with -l option(list audio device) shows one device. [root at a220-0 (ttyAM0) /mnt/nand/pjsip/pjsip-apps/bin/samples]# ./sndinfo-arm-unknown-linux-gnu 13:21:16.466 os_core_unix.c pjlib 1.0 for POSIX initialized 13:21:16.748 pasound.c PortAudio sound library initialized, status=0 13:21:16.749 pasound.c PortAudio host api count=1 13:21:16.749 pasound.c Sound device count=0 13:21:16.751 pjlib select() I/O Queue created (0x65e74) No devices found [root at a220-0 (ttyAM0) /mnt/nand/pjsip/pjsip-apps/bin/samples]# /mnt/nand/usr/local/bin/aplay -l **** List of PLAYBACK Hardware Devices **** card 0: default [C-Media USB Headphone Set ], device 0: USB Audio [USB Audio] Subdevices: 1/1 Subdevice #0: subdevice #0 Why sndinfo cannot detect audio device? Regards, fukunaga