Thanks for your bug report. I'm quite certain that the fix is on its way with this commit. Would you mind checking after the next kernel is upload for Natty, just to verify?
commit 5a8826463c19b0d1a2fc60b2adac0ec318047844 Author: David Henningsson <david.hennings...@canonical.com> Date: Wed Mar 23 08:35:07 2011 +0100 ALSA: HDA: Realtek: Avoid unnecessary volume control index on Surround/Side ** Changed in: alsa-driver (Ubuntu) Status: New => Fix Committed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/748527 Title: [EX58-UD5, Realtek ALC889A, Grey Line Out, Rear] No sound at all -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs