Thank you for the fast reply. I remove backports and alsa driver. I reinstall linux-alsa-driver-modules-2.6.31-19-generic Restart, still not working.
Uninstall linux-alsa-driver-modules-2.6.31-19-generic Install linux-alsa-driver-modules-2.6.31-20-generic Restart, still not working. my system uname -r 2.6.31-20-generic -- acer 7720g laptop 3 spkr's 3rd being sub woofer not working https://bugs.launchpad.net/bugs/516725 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
