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I'm having trouble hearing anything at all under Fedora 16 on this Lenovo T520. Everything in alsamixer is at 100% (both pulseaudio and card). I installed Windows 7 on the laptop to check if the same issue is present on windows, and it's not.

Does anyone know how to deal with this? I've been annoyed by this problem for almost a year, but now with the heat wave on the east coast, I have to run my AC at full blast and I can't hear anything with the AC on.

Under audacity I can get definitely get high volume out of my speakers by just mixing up the sound volume. Is there a way to run a software amplifier between PulseAudio and alsa to crank up the volume or is there something that can be done in alsactl.conf to get the card to normalize the sound volume scale at a lower point? Since this laptop is quite common among Linux users, I would hope that someone has come up with a solution.

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Or try a different kernel version? -- bugzilla.altlinux.org/show_bug.cgi?id=23705 – imz -- Ivan Zakharyaschev Dec 14 '12 at 8:59
Did you ever tried alsamixer through command line? some time GUIs doesn't work properly! I had same problem on my dell laptop which solved by justify PCM column to 100%. – hassan_noori Jan 5 at 9:01
Perhaps volume turned down with some physical wheel thingy? Happened to me once... – vonbrand Feb 4 at 18:48
Do you use fedora 16 default (gnome)? Did you try gnome-control-center sound and maxing out the volume-bar at the bottom? – xx4h Feb 12 at 19:54
funny, i have an identical setup (520/F16) with no sound issues – amphibient Mar 23 at 2:34

2 Answers

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When running alsamixer from the command line, be sure to run with the --view all switch to ensure you're looking at all available mixer controls.

alsamixer -V all

Also, press F6 in alsamixer and check the settings for each device listed.

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I had a similar problem one time in Fedora 18. Turned out Google's "pepperbox" API for Flash had some serious issues with sound, and I solved it by going into /home//.config/google-chrome and killing PepperFlash, then reinstalling flash plugins from Adobe... hope that helps.

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