What happens when you run "aplay -Dplughw:1 something.wav"?There is a delay of exactly as long as the file takes to play with '-Dplughw:0', then I get another shell prompt, as if the system thought the audio was playing, but there is only silence. It works fine with sound card 0 (built-in audio), but sound card 1 (USB audio) generates only silence.
I don't know whether this output from dmesg is relevant:
USB Universal Host Controller Interface driver v2.2
uhci_hcd 0000:00:07.2: Intel Corp. 82371AB/EB/MB PIIX4 USB
uhci_hcd 0000:00:07.2: irq 11, io base 0000ece0
uhci_hcd 0000:00:07.2: new USB bus registered, assigned bus number 1
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 2 ports detected
usb 1-1: new full speed USB device using address 2
usb 1-1: control timeout on ep0in
drivers/usb/core/usb.c: registered new driver hiddev
drivers/usb/input/hid-core.c: ctrl urb status -32 received
input: USB HID v1.00 Device [Apple Computer, Inc. Speakers] on usb-0000:00:07.2-1
drivers/usb/core/usb.c: registered new driver hid
drivers/usb/input/hid-core.c: v2.0:USB HID core driver
ALSA sound/isa/cs423x/cs4231_lib.c:389: cs4231_mce_down - auto calibration time out (1)
usb 1-1: control timeout on ep0in
drivers/usb/core/usb.c: registered new driver snd-usb-audio
And the output from 'amixer -c1':
Simple mixer control 'Bass',0 Capabilities: volume volume-joined Playback channels: Mono Limits: 0 - 48 Mono: 48 [100%] Simple mixer control 'Bass Boost',0 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [on] Simple mixer control 'Treble',0 Capabilities: volume volume-joined Playback channels: Mono Limits: 0 - 48 Mono: 48 [100%] Simple mixer control 'PCM',0 Capabilities: pvolume pswitch pswitch-joined Playback channels: Front Left - Front Right Limits: Playback 0 - 768 Front Left: Playback 768 [100%] [on] Front Right: Playback 768 [100%] [on] Simple mixer control 'Auto Gain Control',0 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [on]
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