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@philcalvin.com
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