On Wed, 28 Jul 2021, Takashi Iwai wrote:
- at high enough gain, recording the microphone is picking up what is
being played via the headphones; maybe it's supposed to be like that, but it surprised me;
Hrm, that doesn't sound right. Some internal loopback in the codec? Dunno. It doesn't pick up the sound physically, right?
How can I tell? If I don't have anything plugged into the jack, playback uses the built-in speakers. In that case there's no feedback. And if I plug in a headset or common headphones, then built-in speakers are automatically muted, and recording the mic can pick up the output signal.
Is there a way to forcefully direct output to the jack instead of built-in speakers even when there isn't anything plugged in?
I am sure it is not picking the sound over the air, but I'm considering it's picking it up electrically near the jack somehow.
- there is a very noticeable "pop" when plugging the headset in/out,
accompanied by
pcieport 0000:00:08.1: PME: Spurious native interrupt! pcieport 0000:00:08.1: PME: Spurious native interrupt!
in dmesg. I'd appreciate info and any help about this issue.
The pop noise is often a thing with the codec and there are a bunch of different workarounds found in the driver. But the spurious interrupt is more worrisome. Is the PCI slot corresponding to the HD-audio controller?
No, it's actually the PCI bridge under which the HDA core resides:
00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir Internal PCIe GPP Bridge to Bus 00:08.1/03:00.6 Audio device: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 10h-1fh) HD Audio Controller
Note that I have autosuspend enabled for PCI devices. If I disable PCI autosuspend for the 03:00.6 HDA device, there's no "pop" and no spurious interrupt. My understanding that the chip generates a power management event when it senses a jack plug/unplug event while suspended. Apparently something about the PME interrupt is not fully in order?
As of now, I'm inclined to take your patch as is, at least as a first-aid workaround. Let's see whether we get a better development soonish.
*nod*, I will appreciate it!
Thank you. Alexander