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+--- Thread: Reboot needed to restore USB audio (/showthread.php?tid=7551)
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Reboot needed to restore USB audio - oldwood - 12-31-2020
Hi everyone,
I am new to Linux Lite. I have it installed on a Asus laptop and I am using USB out to a Emotiva XDA-2 DAC for music. It works well but in the evening I turn off the DAC and in the morning I need to reboot in order to get the OS to find the USB audio channel.
Is there a CMD I can use to re-scan for the USB audio output? I have tried re-plugging the USB cable but that does not work.
Any input is greatly appreciated.
Thanks
Re: Reboot needed to restore USB audio - Valtam - 12-31-2020
Try 3rd post - https://ubuntuforums.org/archive/index.php/t-764576.html
Re: Reboot needed to restore USB audio - oldwood - 12-31-2020
Thanks Jerry I stored the setting so I will try to restore in the morning and let you know how it works.
Happy New Year
Gerry
Re: Reboot needed to restore USB audio - oldwood - 01-02-2021
I tried to restore the ALSA but it did not restore the USB DAC as a sound option.
I was able to replug the USB cable to the DAC and that did restore the option.
I would like to be able to restore without re-plugging just to prevent wear and tear on the cable and port.
I have attached the screenshot of the terminal. It is a png file so the ext needs changing.
Re: Reboot needed to restore USB audio - TheDead - 01-04-2021
I have not checked if 5.x still uses pulseaudio and could be unrelated but just in case...
Before opening any apps, open a terminal and enter the command :
sudo pulseaudio --kill
Then check if the audio workz!
Re: Reboot needed to restore USB audio - oldwood - 01-04-2021
I will give that a try. It is odd because sometimes I can re-plug the USB to the DAC and it pops up while other times it needs a reboot. I have tried turning the DAC off and back on but that does not do anything.
Thanks,
Gerry
Re: Reboot needed to restore USB audio - oldwood - 01-05-2021
[quote author=TheDead link=topic=7887.msg54634#msg54634 date=1609764021]
I have not checked if 5.x still uses pulseaudio and could be unrelated but just in case...
Before opening any apps, open a terminal and enter the command :
sudo pulseaudio --kill
Then check if the audio workz!
I gave this a try and get the response, failed to kill daemon: no such process.
In ALSAMIXER pulse audio is listed so maybe I am doing something wrong?
Re: Reboot needed to restore USB audio - oldwood - 01-07-2021
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
Re: Reboot needed to restore USB audio - TheDead - 01-08-2021
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.
Re: Reboot needed to restore USB audio - oldwood - 01-09-2021
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