I have an HP EliteBook 850 G3 with CX20724: hdaudioC0D0: CX20724: BIOS auto-probing. hdaudioC0D0: action: 0 gpio_led: 0 hdaudioC0D0: autoconfig for CX20724: line_outs=1 (0x16/0x0/0x0/0x0/0x0) type:line hdaudioC0D0: speaker_outs=1 (0x17/0x0/0x0/0x0/0x0) hdaudioC0D0: hp_outs=1 (0x1d/0x0/0x0/0x0/0x0) hdaudioC0D0: mono: mono_out=0x0 hdaudioC0D0: inputs: hdaudioC0D0: Mic=0x19 hdaudioC0D0: Internal Mic=0x1a hdaudioC0D0: Line=0x18 hdaudioC0D0: Enable sync_write for stable communication hdaudioC0D0: action: 1 gpio_led: 0 hdaudioC0D0: action: 2 gpio_led: 0 ... input: HDA Intel PCH Mic as /devices/pci0000:00/0000:00:1f.3/sound/card0/input21 The CX20724 datasheet¹ suggests that it supports headset button events — at least 'Function A' when the mic pin is shorted to ground, if not the other functions. But it isn't working. Only the jack insertion is reported through the corresponding input device, not the button press. I added a printk into snd_hda_jack_unsol_event(), and it isn't even being invoked at all for the button presses; only insertion/removal. How do we make this work? ¹ https://www.tonymacx86.com/attachments/datasheet_cx20724-pdf.203615/
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