RC3 r101470 - Audio Issue Linux Guests

[loukingjr]

I don't know if the AC97 codec was changed but Installed a new copy of Ubuntu 14.04.2 and the volume level is extremely low. OSX 10.11 and 10.10.4 have audio issues.

Audio also breaks up on most Linux guests.

[loukingjr]

Fedora 22 and OpenSUSE 13.2 audio seems fine.

On Lubuntu 15.04 Taylor Swift sounds like Minnie Mouse.

[loukingjr]

Fixed the Ubuntu 14.04.2 problem. Wasn't a VB issue. Still have the other audio problems.

[Perryg]

https://www.virtualbox.org/changeset/56838/vbox

Maybe?

[loukingjr]

Not sure Perry. Could be part of the problem. Audio seems okay in some Linux guests. Wrong sample rate, either too high or too low in others. Then some now stutter. It's an adventure.

[meiser79]

I can also reproduce the issue on VBox 5.0 final. I have a OSX 10.10 host and an Ubuntu 14.04 guest. The sound is too deep and stutters.

I upgraded to 5.0 and use my already available guests, no fresh install.

[loukingjr]

I can also reproduce the issue on VBox 5.0 final. I have a OSX 10.10 host and an Ubuntu 14.04 guest. The sound is too deep and stutters.

I upgraded to 5.0 and use my already available guests, no fresh install.

create a sound.conf file with these lines…

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options snd-intel8x0 ac97_clock=48000
options snd slots=snd-intel8x0
alias snd-card-0 snd-intel8x0

then add it to the /etc/modprobe.d folder in Ubuntu. Restart the guest.

[meiser79]

I read somewhere here that the devs added a different AC97 codec for linux, but that it's only used for new guests (?). How can it be used on existing guests?

[birdie]

I read somewhere here that the devs added a different AC97 codec for linux, but that it's only used for new guests (?). How can it be used on existing guests?

Edit XXXXXXXXXX.vbox and change

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      <AudioAdapter controller="AC97" driver="ALSA" enabled="true"/>

to

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      <AudioAdapter controller="AC97" codec="AD1980" driver="ALSA" enabled="true"/>

Perhaps there's a command for that, but I'm too lazy to figure it out.

[meiser79]

Thanks! Here's the command.

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VBoxManage modifyvm "machinename" --audiocodec ad1980

[michaln]

Does it make a difference? It should, but only wide testing can say for certain

[loukingjr]

Yes it works. However, corrects the sampling rate but drops the volume to almost nothing. At least with Ubuntu based guests.

It seems to kill audio in Debian 8.1

[loukingjr]

I fixed Debian 8.1 by restoring a previous version and just installing the 5.0 GAs. Didn't run the "AD1980" command.