I get error message from HAL if I try to unmount a usb drive if its contents are being displayed in Dolphin file manager. In order to unmount, I have to display something other than usb contents, click on usb icon in dolphin and select unmount in a pop up menu. Is there a way I can unmount the usb without displaying other content? It's possible on linux. Is this a polkit, policykit or some other configuration issue?