alsamixer does not refresh controls if they depend on one another

My alsamixer interface offers a Headphone volume control, and a "Independent Headphone" binary switch. If the latter switch is flipped, the Headphone control slider does not change state (enabled vs. greyed out) until I quit and restart alsamixer.

Expected behaviour: flipping this "Indep' HP" switch should have immediate action vs. greying out/re-enabling the Headphone volume slider.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: alsa-utils 1.0.24.2-0ubuntu6
ProcVersionSignature: Ubuntu 2.6.38-10.46-generic 2.6.38.7
Uname: Linux 2.6.38-10-generic x86_64
Architecture: amd64
Date: Tue Jul 19 17:15:54 2011
ProcEnviron:
 LANGUAGE=de:en
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: alsa-utils
UpgradeStatus: Upgraded to natty on 2011-05-02 (78 days ago)