On 7/30/2017 1:37 PM, Bernard Lheureux wrote: > On 29/07/2017 02:15, Fred Smith wrote: > > Anybody have the same problem that I have with JACK plugged headphones > (analogic) ? > The volume controls on the cable of the headphones do not work on > CentOS 7 on my Lenovo Thinkpad T530... > How could I solve this ? volume controls on analog headphones are purely analog, the computer doesn't even know its there, its just an attenuator on the analog signal. -- john r pierce, recycling bits in santa cruz