Hi,
In Ubuntu Japanese Community forum, I help the person who cannot set the
PCM output volume of USB device with amixer or alsamixer.
https://forums.ubuntulinux.jp/viewtopic.php?id=11984&p=1
He can get PCM output (2 channels) from the device but cannot set their
volume correctly. I adviced him to use ALSA's mixer software but he
cannot launch it with "amixer: Mixer hw:1 load error: Invalid argument".
It seems that we can get enough information from /proc filesystem but
amixer does not work well.
Do you know the similar cases?
Regards
##########
Linux kernel 2.6.38
alsa-utils 1.0.24.2
libasound2 (alsa-lib) 1.0.24.1
$ cat /proc/asound/version;
Advanced Linux Sound Architecture Driver Version 1.0.23.
$ cat /proc/asound/cards;
1 [V8237 ]: VIA8237 - VIA 8237
VIA 8237 with CMI9761A+ at 0xe400, irq 22
1 [SX ]: USB-Audio - Sound Blaster Digital Music SX
Creative Technology Ltd. Sound Blaster Digital
Music SX at usb-0000:00:10.0-1,
$ cat /proc/asound/devices;
1: : sequencer
2: [ 1- 1]: digital audio playback
3: [ 1- 0]: digital audio playback
4: [ 1- 0]: digital audio capture
5: [ 1] : control
6: [ 0- 1]: digital audio playback
7: [ 0- 1]: digital audio capture
8: [ 0- 0]: digital audio playback
9: [ 0- 0]: digital audio capture
10: [ 0] : control
33: : timer
$ cat /proc/asound/card1/usbmixer;
USB Mixer: usb_id=0x041e3090, ctrlif=0, ctlerr=0
Card: Creative Technology Ltd. Sound Blaster Digital Music SX at
usb-0000:00:10.0-1,
Unit: 3
Control: name="PCM Playback Volume", index=0
Info: id=3, control=2, cmask=0x3, channels=2, type="S16"
Volume: min=-25600, max=0, dBmin=-10000, dBmax=0
Unit: 3
Control: name="PCM Playback Switch", index=0
Info: id=3, control=1, cmask=0x0, channels=1, type="INV_BOOLEAN"
Volume: min=0, max=1, dBmin=0, dBmax=0
Unit: 4
Control: name="Digital In Playback Volume", index=0
Info: id=4, control=2, cmask=0x3, channels=2, type="S16"
Volume: min=-25600, max=0, dBmin=-10000, dBmax=0
Unit: 4
Control: name="Digital In Playback Switch", index=0
Info: id=4, control=1, cmask=0x0, channels=1, type="INV_BOOLEAN"
Volume: min=0, max=1, dBmin=0, dBmax=0
Unit: 6
Control: name="Headphone Playback Volume", index=0
Info: id=6, control=2, cmask=0x3, channels=2, type="S16"
Volume: min=-25600, max=0, dBmin=-10000, dBmax=0
Unit: 6
Control: name="Headphone Playback Switch", index=0
Info: id=6, control=1, cmask=0x0, channels=1, type="INV_BOOLEAN"
Volume: min=0, max=1, dBmin=0, dBmax=0
Unit: 7
Control: name="PCM Capture Source", index=0
Info: id=7, control=0, cmask=0x0, channels=1, type="U8"
Volume: min=1, max=2, dBmin=0, dBmax=0
Unit: 8
Control: name="Headphone Playback Switch", index=1
Info: id=8, control=1, cmask=0x0, channels=1, type="INV_BOOLEAN"
Volume: min=0, max=1, dBmin=0, dBmax=0
Unit: 9
Control: name="Digital In Playback Switch", index=1
Info: id=9, control=1, cmask=0x0, channels=1, type="INV_BOOLEAN"
Volume: min=0, max=1, dBmin=0, dBmax=0
$ amixer -c 1;
amixer: Mixer hw:1 load error: Invalid argument
##########
Takashi Sakamoto
[email protected]
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