> > > The alsa-info.sh log from the mac mini (the usb headset will not stay connected on the dell e6220 long enough for it to work) is at: > > <a href="http://www.alsa-project.org/db/?f=5e7f45089ce82985c003fa2608bed82726ebbdf6">http://www.alsa-project.org/db/?f=5e7f45089ce82985c003fa2608bed82726ebbdf6</a> you need to find out the usb problem in system log of your e6220 how many audio jacks do your macmini have ? seem only line in support jack detect, internal mic support balanced but ext mic does not support jack detect Node 0x0c [Pin Complex] wcaps 0x41048b: Stereo Amp-In Control: name="Line Capture Volume", index=0, device=0 ControlAmp: chs=3, dir=In, idx=0, ofs=0 Amp-In caps: ofs=0x00, nsteps=0x03, stepsize=0x27, mute=0 Amp-In vals: [0x00 0x00] Pincap 0x00000024: IN Detect Pin Default 0x018b3020: [Jack] Line In at Ext Rear Conn = Comb, Color = Blue DefAssociation = 0x2, Sequence = 0x0 Pin-ctls: 0x20: IN Unsolicited: tag=00, enabled=0 Power states: D0 D3 EPSS Power: setting=D0, actual=D0 Delay: 1 samples Node 0x0d [Pin Complex] wcaps 0x41048b: Stereo Amp-In Control: name="Internal Mic Capture Volume", index=0, device=0 ControlAmp: chs=3, dir=In, idx=0, ofs=0 Amp-In caps: ofs=0x00, nsteps=0x03, stepsize=0x27, mute=0 Amp-In vals: [0x00 0x00] Pincap 0x00001764: IN Detect Balanced Vref caps: HIZ 50 GRD 80 Pin Default 0x90a00110: [Fixed] Mic at Int N/A Conn = Unknown, Color = Unknown DefAssociation = 0x1, Sequence = 0x0 Misc = NO_PRESENCE Pin-ctls: 0x24: IN VREF_80 Unsolicited: tag=00, enabled=0 Power states: D0 D3 EPSS Power: setting=D0, actual=D0 Delay: 1 samples Node 0x12 [Pin Complex] wcaps 0x41000b: Stereo Amp-In Control: name="Mic Capture Volume", index=0, device=0 ControlAmp: chs=3, dir=In, idx=0, ofs=0 Amp-In caps: ofs=0x00, nsteps=0x02, stepsize=0x27, mute=0 Amp-In vals: [0x00 0x00] Pincap 0x00000020: IN Pin Default 0x01ab9070: [Jack] Mic at Ext Rear Conn = Comb, Color = Pink DefAssociation = 0x7, Sequence = 0x0 Pin-ctls: 0x20: IN Delay: 1 samples <a href="http://mailman.alsa-project.org/pipermail/alsa-devel/2012-March/050186.html">http://mailman.alsa-project.org/pipermail/alsa-devel/2012-March/050186.html</a> what is the exact meaning of balanced mode ? 7.3.3.16 EAPD/BTL Enable BTL controls the output configuration of a Pin Widget which has indicated support for balanced I/O (bit 6, Pin Capabilities Parameter). When this bit is 0, the output drivers are configured in normal, single-ended mode; when this bit is 1, they are configured in balanced mode. Note that in balanced mode, the Pin Widget has twice as many pins as it does in normal mode; i.e., a stereo Pin Widget in balanced mode has four signal pins (in addition to Vref pins). However, in both modes it must appear to software as a single Pin Widget. The additional pins must be reserved to this purpose; thus, in a configuration supporting BTL outputs the additional pins may not be enumerated as a separate Pin Widget.