Comment 3 for bug 151877

I have the same problem too, I thought it was just my laptop because I don't have this problem on my desktop which has a different sound card. Running Gutsy final on a Sony Vaio PCG-K23. Never experienced this problem before with any version since 5.04. Attached you will find the output of lspci, lsmod and gnome-volume-control --gst-debug-level=3.

To restate the problem, sliding the volume control from the applet causes the icon to change to mute and the mute checkbox to be checked, but sound still outputs correctly. I noticed if I open the volume control window, sliding the master volume there doesn't affect the icon on the applet or the checkbox. This only seems to happen from the applet directly.