I have the same or similar issue: If I set up to "Do nothing" in Power settings when I close the lid of the laptop it actually locks the screen and then I cannot use the hardware knob of my external USB DAC to increase or decrease the volume.
When I say "do nothing" it ignores the request by locking the screen. The second issue is that there is nothing wrong in using hardware buttons or the knob of external usb dac - if those (hardware) buttons/knobs are not phisically protected then I guess it is normal to be available. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-screensaver in Ubuntu. https://bugs.launchpad.net/bugs/970517 Title: Change sound volume using keyboard multimedia keys while screen is locked Status in “gnome-screensaver” package in Ubuntu: Confirmed Bug description: If I lock screen using ctrl+L or it locked by timer, I can't using hardware buttons for changing volume. But it's not security feature, so it will be very convenient if we can change volume without necessity to unlock system. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: unity 5.8.0-0ubuntu2 ProcVersionSignature: Ubuntu 3.2.0-20.33-generic-pae 3.2.12 Uname: Linux 3.2.0-20-generic-pae i686 ApportVersion: 1.95-0ubuntu1 Architecture: i386 CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell] Date: Sun Apr 1 04:32:44 2012 InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta i386 (20120301) ProcEnviron: TERM=xterm PATH=(custom, no user) LANG=uk_UA.UTF-8 SHELL=/bin/bash SourcePackage: unity UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/970517/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp