Created attachment 125349 [details] screenshot of GNOME Settings I have a Lenovo Thinkpad X1 and I have it docked to a Lenovo Thinkpad OneLink Dock (http://shop.lenovo.com/us/en/itemdetails/4X10A06077/460/6D501EE899104FF9A362D739642CFC27) It seems like for some reason, pulseaudio sees this dock as two devices, and has two different ideas about how loud the volume is.
PulseAudio thinks that your hardware supports a digital output via S/PDIF (in additional to the standard analog output via your headphone jack / speakers). I'm not sure whether that is true or not. Could you post the output of alsa-info? I'm not sure how we can verify whether what we detect is accurate or not.
Created attachment 125509 [details] alsa-info output
http://git.alsa-project.org/?p=alsa-lib.git;a=blob;f=src/conf/cards/USB-Audio.conf;hb=HEAD#l35 # If a device does not use the first PCM device for digital data, the device # number for the iec958 device can be changed here.
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