I am using snd-dummy on a NGW100 card with buildroot provided by Atmel. The alsa version is 1.0.14a and the kernel is 2.6.23.

I have compiled three versions of the snd-dummy driver: the original, one with capture_count=0 and one with playback_count=0. When I use snd_pcm_new() with playback_count=0, there will be no PCM devices other than the "null" (see below). Is this expected? Can I still capture from this driver (and a real driver with the same symptoms)?

Best regards William Juul

Listings (annotated):

(with original snd-dummy and modified snd-dummy to use capture_count=0)

# modprobe snd-dummy # # arecord -l **** List of CAPTURE Hardware Devices **** card 0: Dummy [Dummy], device 0: Dummy PCM [Dummy PCM] Subdevices: 8/8 Subdevice #0: subdevice #0 Subdevice #1: subdevice #1 Subdevice #2: subdevice #2 Subdevice #3: subdevice #3 Subdevice #4: subdevice #4 Subdevice #5: subdevice #5 Subdevice #6: subdevice #6 Subdevice #7: subdevice #7 # # arecord -L default:CARD=Dummy Dummy, Dummy PCM Default Audio Device null Discard all samples (playback) or generate zero samples (capture)

# reboot .. (with modified snd-dummy to use playback_count=0) # modprobe snd-dummy # arecord -l **** List of CAPTURE Hardware Devices **** card 0: Dummy [Dummy], device 0: Dummy PCM [Dummy PCM] Subdevices: 8/8 Subdevice #0: subdevice #0 Subdevice #1: subdevice #1 Subdevice #2: subdevice #2 Subdevice #3: subdevice #3 Subdevice #4: subdevice #4 Subdevice #5: subdevice #5 Subdevice #6: subdevice #6 Subdevice #7: subdevice #7 # arecord -L null Discard all samples (playback) or generate zero samples (capture) #