Ubuntu – No sound on laptop speakers on an Acer Aspire 6920

Run alsamixer -c 0 in your console and use the arrow keys to play around with the volumes.

For me: Setting Master to a value where the sound quality was good enough made it very very low. Setting Master to maximum, decreasing PCM to 81 and setting everything else to 0 fixed the problem.

UPDATE: (for Ubuntu 10.10) Click on the volume icon in the upper-right corner, then click on Sound Preferences, and make sure that the Output volume doesn't go above "Unamplified." Then, click on the volume icon again and see where the volume meter is positioned. That is the maximum volume you should set in order to hear a clear sound.

OR: (for Ubuntu 10.10) Click on the volume icon in the upper-right corner, then click on Sound Preferences, set the main volume to 100% and set the volume for each application to a more appropriate level. Each time you open an application that needs to use sound for the first time, you have to do this (because applications that don't currently use sound don't appear in that list).

You currently have to choose between annoying and complicated :(

As ALC1200 and ALC888 seem to be very similar (see this German Wiki Entry) you can try my solution for the Intel HDA ALC1200 on my Acer Aspire 5920 G laptop. After upgrading to Ubuntu 12.04 Precise Pangolin from 11.10 my speakers continued to output the sound when plugging in headphones. In 11.10 the speakers were muted automatically when a headphone was plugged in.

I fixed it by adding a line to /etc/modprobe.d/alsa-base.conf :

options snd-hda-intel model=auto probe_mask=1

Now I've got a lot more options/controls when running alsamixer. One is "Auto-Mute Mode". Set this to "Enabled" if it does not work out of the box.

stehpan