22 Nov
2004
22 Nov
'04
6:27 p.m.
Hi,
first of all, thanks for your detailed help.
You have two kernel drivers for USB MIDI devices.
* 'snd-usb-audio' is the ALSA module containing the drivers
for Audio and MIDI USB devices.
* 'usb-midi' is the OSS/Free module for USB MIDI devices
only. * 'audio' is the OSS/Free module for USB Audio
devices. You can have both modules compiled and installed,
but you should only use one of them at a time. ALSA does
not need the OSS/Free modules. It can do OSS emulation
using it's own resources.
OK, very weird. Since I have installed Gentoo, ALSA never die
restore the last settings of alsamixer. After every reboot,
all channels have been down and muted.
Both drivers want to be loaded and claim the device if
you
have hotplug installed. To "blacklist" one of them, insert
a line with the module name in the file
/etc/hotplug/blacklist.
[...]
Thanks a lot again.
I blacklisted usb-midi, and now, after a reboot, alsa does not
start anymore.
I just telephoned with a friend, and we found out that the
device was listed in
/lib/modules/2.6.7-gentoo-r6/modules.usbmap
so the module was always loaded after pluggin in the UM-1S.
I removed the module file manually from the modules directory,
and after a reboot, everything seems to be fine - even my
alsamixer settings are restored!
The presence of usb-midi and snd-usb-audio seems to have
caused a really messed up setup.
I'm just building a new kernel with all OSS stuff disabled (I
really do not expect to need any of the OSS drivers), and I
hope this will bring me a great success.
Thanks for all of your hints, if I do any important and
successful step, I'll keep you informed.
Thanks a lot & kind regards
ce