On Fri, 16 Apr 2021 00:01:29 +0200, Phil Calvin wrote: > > Fix two bugs with the Intel HDA Realtek ALC233 sound codec > present in Intel NUC NUC8i7BEH and probably a few other similar > NUC models. > > These codecs advertise a 4-level microphone input boost amplifier on > pin 0x19, but the highest two boost settings do not work correctly, > and produce only low analog noise that does not seem to contain any > discernible signal. There is an existing fixup for this exact problem > but for a different PCI subsystem ID, so we re-use that logic. > > Changing the boost level also triggers a DC spike in the input signal > that bleeds off over about a second and overwhelms any input during > that time. Thankfully, the existing fixup has the side effect of > making the boost control show up in userspace as a mute/unmute switch, > and this keeps (e.g.) PulseAudio from fiddling with it during normal > input volume adjustments. > > Finally, the NUC hardware has built-in inverted stereo mics. This > patch also enables the usual fixup for this so the two channels cancel > noise instead of the actual signal. > > Signed-off-by: Phil Calvin <phil@xxxxxxxxxxxxxx> Thanks, applied now with a minor fix of the quirk entry position (sorted in order). But the patch text wasn't cleanly applicable and I had to edit it manually. I guess this is due to your MUA setup. Please check it and fix at the next time. Takashi
