I can confirm this bug with Kubuntu 8.04 and even before.
All volume controls translate into key presses - please see:
"/etc/acpi/volupbtn.sh" and inside this script "acpi_fakekey $KEY_VOLUMEUP".
cat /proc/asound/cards
0 [Intel ]: HDA-Intel - HDA Intel
HDA Intel at 0xfe9fc000 irq 20
1 [Device ]: USB-Audio - USB Audio Device
Elite Silicon USB Audio Device at usb-0000:00:1d.0-2,
full speed
would always list the HDA-Intel as first sound card.
I never got a clue how to use alsa - it's so obscure and their documentation
really sucks.
And I never really got the time on how to tweak the acpi_fakekey and the
usb/hid interface. What if when I press the "KEY_CALC" I want to launch a
specific application, not the default one. I would be really interested in an
easy way to do this.
One solution would be to set as first soundcard the USB one - when plugged.
A workaround would be to extend the "/etc/acpi/volupbtn.sh" script - when it
detects a second soundcard to use commands like "/usr/bin/amixer -c 1 set PCM
10+" , for instance.
--
Headset volume control doesn't change headset volume
https://bugs.launchpad.net/bugs/201391
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