Hardware - Support > Sound

Reboot needed to restore USB audio

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TheDead:
Maybe unpluging the DAC before going in suspend?
Not really a solution but... it's better than buyng a horseshoe and a four-leaf clover. ;)

oldwood:
While that did not work! when I resume from suspend there is no connection to the USB DAC and it is hard to get it back, so no change.

I might need to give up and just use a different DAC.

Gerry

oldwood:
So I might have found a solution. I think the problem is related to USB auto suspend. I disabled auto suspend by following this guide.

https://ywjheart.wordpress.com/2018/07/17/disable-usb-auto-suspend-in-ubuntu-debian/

I will post back after a while when I know if it stays connected.

Thanks guys for your suggestions.

Gerry

TheDead:
Hi,

Your problem seems "deeper" than just the sound engine.
Maybe a Linux guru (or a web search?) could tell you how reset a linux "device" and not just the sound engine.

Maybe activating the "Plug and play" function in the BIOS? but that seems like a shot in the dark.

oldwood:
So I am still trying to get the OS to see the Emotiva USB DAC on resume from sleep. Sometimes re-plugging works sometimes it does not, sometimes a re-boot works and sometimes it does not.

I tried alsactl restore and got a more informative output but it does not connect the DAC. I have attached the screenshot, it is a png file.

I have a Asus Xonar U7 mk2 DAC and it is found and is connected on resume from sleep but I would like to use the Emotiva DAC if possible. The Xonar USB is USB powered so maybe that is why it is seen and connected on resume?

I don't know what triggers the connection of the USB DAC or if I can force it to re-scan and connect.

Any and all suggestions are welcomed.

Thanks,
Gerry

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