no sound after suspend/resume

Question

I have no audio on lubuntu 12.04 after resuming from suspend. I tried

sudo alsa force-reload

to no avail. Sound works after reboot. Please help.

Answer 1

For some systems it is necessary to kill the pulseaudio process and prevent it from re-loading before restarting ALSA. If the following procedure works, it can be automated.

1. Set up Pulseaudio so it does not respawn automatically:

   mkdir ~/.pulse
   echo "autospawn = no" >> ~/.pulse/client.conf
   

2. Suspend your computer and wake him up

3. Restart ALSA:

   sudo alsa force-reload
   

4. Start pulseaudio:

   pulseaudio --start
   

To revert the changes, delete the file ~/.pulse/client.conf

Answer 2

After consulting some posts, what I've done to get mine to work again:

1. Set pulseaudio not to respawn by creating config file at home directory:

   mkdir ~/.pulse
   echo "autospawn = no" >> ~/.pulse/client.conf
   

2. Create a file (50alsa) to automate after system suspend.

   sudo gedit /etc/pm/sleep.d/50alsa
   

3. Add the following to the file. Notice 'pulseaudio --kill' added.

   case "$1" in
           hibernate|suspend)
                   # Stopping is not required
                   ;;
           thaw|resume)
                   pulseaudio --kill                
                   /sbin/alsa force-reload
                   pulseaudio --start
                   ;; 
           *) exit $NA
                   ;;
   esac 
   

Answer 3

Try pressing CTRL+ALT+F1 to change tty screens then press CTRL+ALT+F7 to go back to desktop.

This sometimes brings back sound but failing that, change screen resolution and change it back for a different fix. This works for HDMI audio as well.

Answer 4

I tried this, but that didn't help.

To solve this without restart or another suspend, I solved it with simply

pulseaudio --kill
pulseaudio --start

Answer 5

Try running

pulseaudio -k && sudo alsa force-reload