On 01/07/2017 01:42 PM, Laurent CREPET wrote: > On Sat, Jan 7, 2017 at 10:23 PM, Alice Wonder <alice at domblogger.net> wrote: > >> Logitech H540 headphones were working fine. >> >> Suddenly stopped. >> >> > Maybe a stupid question, but did you try your headphones on another > computer? > Is the device listed in the ouput of command "lsusb"? > I got that to work. I had to remove the blacklist for the useless Intel HD audio on the video card that CentOS 7 likes to pick by default even though the video card doesn't have an audio out except HDMI - but with that driver allowed, the audio system reset and the USB headphones are no longer listed as disabled. There has to be a better way and there needs to be a way to enable a device that is listed as disabled for unknown reasons, serious UI issue. I don't understand why the sound control panel doesn't allow one to enable a device it has listed as disabled. The disabled kernel module was for Intel HD which is NOT what the USB headphones uses, and it works fine with that kernel module disabled, it just wouldn't let me enable the headphones after whatever disabled them disabled them.