Reduce the volume for the right channel, and slide the volume button for the left channel until you start to hear the sound. It is important to reduce the volume for the right channel, first !!!
After reboot, I have to do this again, so this is a bug. -- problem with sound at laptop Acer5101 https://launchpad.net/bugs/76310 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs