snd-usb-audio

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snd-usb-audio

Hannes Werner
Hello Voyage community,

I'm running voyage-linux on my Alix 2C2 as a music server with MPD
(Music Player Daemon). As loudspeakers I use Logitechs Z-5, which are
Loudspeakers that have a DAC inside and are driven via USB (without
external power supply).
These loudspeakers, when plugged in load the kernel-module
snd-usb-audio. So far everything works really great. But from time to
time (about two or three minutes, sometimes half an hour) the kernel
disconnects this device and reconnects it again.
Here is an output of dmesg:

[25388.082748] generic-usb 0003:046D:0A13.004E: input: USB HID v1.00
Device [Logitech Logitech Z-5 Speakers] on usb-0000:00:0f.4-1/input2
[25436.251122] hub 2-0:1.0: port 1 disabled by hub (EMI?), re-enabling...
[25436.252040] usb 2-1: USB disconnect, address 79
[25436.467851] usb 2-1: new full speed USB device using ohci_hcd and address 80
[25436.605078] usb 2-1: configuration #1 chosen from 1 choice
[25436.676864] input: Logitech Logitech Z-5 Speakers as /class/input/input79
[25436.677838] generic-usb 0003:046D:0A13.004F: input: USB HID v1.00
Device [Logitech Logitech Z-5 Speakers] on usb-0000:00:0f.4-1/input2
[25498.971441] hub 2-0:1.0: port 1 disabled by hub (EMI?), re-enabling...
[25498.972359] usb 2-1: USB disconnect, address 80
[25499.188171] usb 2-1: new full speed USB device using ohci_hcd and address 81
[25499.325339] usb 2-1: configuration #1 chosen from 1 choice
[25499.397019] input: Logitech Logitech Z-5 Speakers as /class/input/input80
[25499.397180] generic-usb 0003:046D:0A13.0050: input: USB HID v1.00
Device [Logitech Logitech Z-5 Speakers] on usb-0000:00:0f.4-1/input2

Unfortunately I can not find a solution for it and I would like to ask
for your experiences in this case.

Thank you very much for your help in advance.

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Re: snd-usb-audio

Antti Turunen
Hello,

I cannot help with the actual question, but this indeed is an interesting application to Alix and Voyage!

Which other applications are there are to be used with this setup? E.g. how can I listen to individual web radio channels (just as their own url) not existing in icecast?


Cheers,

Anttu




On 11/23/2009 05:56 PM, Johann Wolfgang Goethe wrote:
Hello Voyage community,

I'm running voyage-linux on my Alix 2C2 as a music server with MPD
(Music Player Daemon). As loudspeakers I use Logitechs Z-5, which are
Loudspeakers that have a DAC inside and are driven via USB (without
external power supply).
These loudspeakers, when plugged in load the kernel-module
snd-usb-audio. So far everything works really great. But from time to
time (about two or three minutes, sometimes half an hour) the kernel
disconnects this device and reconnects it again.
Here is an output of dmesg:

[25388.082748] generic-usb 0003:046D:0A13.004E: input: USB HID v1.00
Device [Logitech Logitech Z-5 Speakers] on usb-0000:00:0f.4-1/input2
[25436.251122] hub 2-0:1.0: port 1 disabled by hub (EMI?), re-enabling...
[25436.252040] usb 2-1: USB disconnect, address 79
[25436.467851] usb 2-1: new full speed USB device using ohci_hcd and address 80
[25436.605078] usb 2-1: configuration #1 chosen from 1 choice
[25436.676864] input: Logitech Logitech Z-5 Speakers as /class/input/input79
[25436.677838] generic-usb 0003:046D:0A13.004F: input: USB HID v1.00
Device [Logitech Logitech Z-5 Speakers] on usb-0000:00:0f.4-1/input2
[25498.971441] hub 2-0:1.0: port 1 disabled by hub (EMI?), re-enabling...
[25498.972359] usb 2-1: USB disconnect, address 80
[25499.188171] usb 2-1: new full speed USB device using ohci_hcd and address 81
[25499.325339] usb 2-1: configuration #1 chosen from 1 choice
[25499.397019] input: Logitech Logitech Z-5 Speakers as /class/input/input80
[25499.397180] generic-usb 0003:046D:0A13.0050: input: USB HID v1.00
Device [Logitech Logitech Z-5 Speakers] on usb-0000:00:0f.4-1/input2

Unfortunately I can not find a solution for it and I would like to ask
for your experiences in this case.

Thank you very much for your help in advance.

_______________________________________________
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[hidden email]
http://list.voyage.hk/mailman/listinfo/voyage-linux
  

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Re: snd-usb-audio

Joshua Anhalt
In reply to this post by Hannes Werner
Without much familiarity with these speakers, I suspect the Alix board may not be able to provide sufficient power to your speakers.  (Am I understanding you and the Logitech website correctly, all power for the speakers originates from the single USB port?)

If you have a powered USB hub (a hub with an attached power supply), try connecting the speakers through the hub to the Alix board.

If you have other USB peripherals on this system, try removing them to reduce the power draw.

The Alix 2d2 (the successor to your Alix 2c2) increases the available current to the USB ports.  If using the hub works, but you require a more compact solution, this newer board may be able to directly power the speakers.

Standard USB 2.0 ports are speced to source at most 500mA at 5V (or 2.5 Watts.)  Many computers can source more than this, but it is not guaranteed.  There are also powered USB ports, but these are less common and not specifically related to this question.

Joshua

On Nov 23, 2009, at 10:56 AM, Johann Wolfgang Goethe wrote:

Hello Voyage community,

I'm running voyage-linux on my Alix 2C2 as a music server with MPD
(Music Player Daemon). As loudspeakers I use Logitechs Z-5, which are
Loudspeakers that have a DAC inside and are driven via USB (without
external power supply).
These loudspeakers, when plugged in load the kernel-module
snd-usb-audio. So far everything works really great. But from time to
time (about two or three minutes, sometimes half an hour) the kernel
disconnects this device and reconnects it again.
Here is an output of dmesg:

[25388.082748] generic-usb 0003:046D:0A13.004E: input: USB HID v1.00
Device [Logitech Logitech Z-5 Speakers] on usb-0000:00:0f.4-1/input2
[25436.251122] hub 2-0:1.0: port 1 disabled by hub (EMI?), re-enabling...
[25436.252040] usb 2-1: USB disconnect, address 79
[25436.467851] usb 2-1: new full speed USB device using ohci_hcd and address 80
[25436.605078] usb 2-1: configuration #1 chosen from 1 choice
[25436.676864] input: Logitech Logitech Z-5 Speakers as /class/input/input79
[25436.677838] generic-usb 0003:046D:0A13.004F: input: USB HID v1.00
Device [Logitech Logitech Z-5 Speakers] on usb-0000:00:0f.4-1/input2
[25498.971441] hub 2-0:1.0: port 1 disabled by hub (EMI?), re-enabling...
[25498.972359] usb 2-1: USB disconnect, address 80
[25499.188171] usb 2-1: new full speed USB device using ohci_hcd and address 81
[25499.325339] usb 2-1: configuration #1 chosen from 1 choice
[25499.397019] input: Logitech Logitech Z-5 Speakers as /class/input/input80
[25499.397180] generic-usb 0003:046D:0A13.0050: input: USB HID v1.00
Device [Logitech Logitech Z-5 Speakers] on usb-0000:00:0f.4-1/input2

Unfortunately I can not find a solution for it and I would like to ask
for your experiences in this case.

Thank you very much for your help in advance.

_______________________________________________
Voyage-linux mailing list
[hidden email]
http://list.voyage.hk/mailman/listinfo/voyage-linux



_______________________________________________
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[hidden email]
http://list.voyage.hk/mailman/listinfo/voyage-linux
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