alsamixer não altera o volume real do som da minha placa de som USB (embora os mostradores se movam bem)
# uname -a
Linux RPN 2.6.28.10-rpn7.2 #1 SMP Tue Jun 7 07:23:01 EDT 2011 i686 GNU/Linux
# cat /proc/asound/version
Advanced Linux Sound Architecture Driver Version 1.0.18rc3.
# dpkg -l | grep alsa
ii alsa-base 1.0.17.dfsg-4 ALSA driver configuration files
ii alsa-oss 1.0.15-1 ALSA wrapper for OSS applications
ii alsa-utils 1.0.16-2 ALSA utilities
# cat /proc/asound/cards
0 [default ]: USB-Audio - USB AUDIO
USB AUDIO at usb-0000:00:1d.0-1, full speed
1 [default_1 ]: USB-Audio - USB PnP Sound Device
C-Media Electronics Inc. USB PnP Sound Device at usb-0000:00:1d
# lsusb
Bus 005 Device 002: ID 0d8c:013c C-Media Electronics, Inc.
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 002: ID 1631:5000 Good Way Technology
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 002: ID 1130:f211 Tenx Technology, Inc. TP6911 Audio Headset
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 006: ID 0755:2626 Aureal Semiconductor
Bus 001 Device 003: ID 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
O mesmo problema aqui. Acho que a placa de som é apenas uma porcaria ... Comprei algumas placas semelhantes da DX (encomendadas sob o mesmo SKU em momentos diferentes). Um com led amarelo é uma porcaria, um com led verde é incrível.