Logitech Z-5 USB speakers sometimes not detected

[Antonio Lopez]

The Z-5 are USB-powered speakers, behaving optionally as a standalone external USB audio card (having its audio input through the same USB power wire) or as a pair of passive speakers when using a normal audio jack.

First I had to append the following to /etc/modprobe.d/alsa-base.conf in order for the speakers to be "properly" detected:

options snd-usb-audio index=0

Then the Z-5 seem to be detected by the USB subsystem only after alternative reboots/shutdowns, as lsusb command shows. They work normally when using a standard audio jack through the MB sound system (Azalia), though.

I shall provide any additional debugging info upon request.

[Antonio Lopez (amlopezalonso)]

This issue is fixed after adding the following lines to /etc/modprobe.d/alsa-base.conf:

alias snd-card-0 snd-usb-audio
alias snd-card-1 snd-hda-intel
options snd-usb-audio index=0
options snd-hda-intel index=1

Regards.

[Pietrod (pietrodcof)]

yes, you are very kind...
but can you also explain us how to edit protected files?
thanks

[Pietrod (pietrodcof)]

ok, i solved, it have to be used this command to edit:
sudo gedit /etc/modprobe.d/alsa-base.conf

[Pietrod (pietrodcof)]

it doesn't work for me...

[Thomas Mashos (tgm4883)]

We really do appreciate you opening this ticket to help improve Mythbuntu, but it needs to be closed for a number of reasons. The biggest one is that upstream believes this to be fixed in the latest version. Could you please verify if this issue still exists in the latest version?

Please do not let the closing of this ticket dissuade you from opening a new ticket if this (or any other) problem occurs with the newer versions.