Oh, I post a wrong output about cards...
$ cat /proc/asound/cards;
0 [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,
Regards
(2011年09月04日 06:44), Takashi Sakamoto wrote:
> 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
> o-takashi@xxxxxxxxxxxxx
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