Hui Wang,
Apologies for the slow reply.
Do you mean that you also have quiet sound after the boot?
Today I upgraded to 4.19.12, and the results seem the same. I'm running
Funtoo Linux with "gentoo-sources" kernel, HDA and the Realtek codec as
modules and plain ALSA with no daemons. I tried to compile them into
the main kernel image, but the results were the same, except that the
LEDs didn't work.
Here are sone more details:
The noise level I hear does not change with the playback volume. It's
stronger when I play something (e.g., with mplayer) or touch the
touchpad.
Without the 0x12 line, alsamixer shows heasphone and speaker controls at
100%, and "alsactl store" has {Headphone,Speaker} Playback
{Volume,Switch}. Under the standard kernel (with your patch), the
aforementioned controls in alsamixer show up as "00" in a box, and
alsactl has only "Line Out Playback Volume" (and the two Switches). Is
it possible that "line out" is treated differently from "headphone" by
the hardware, or is it just a name?
With the standard kernel, the output of "alsactl store" is identical
whether the sound is in the "too quiet" state or in the "noisy
headphone" state.
Sometimes after I warm-reboot from a standard kernel to a kernel without
the 0x12 line, I hear clicks when muting and unmuting the output, or
noise, but they disappear after I play something.
I put my kernel config and alsactl store output under
http://www.vygo.net/hda/ but I don't know if it aids debugging in any
way. Do you think it may help if I try your kernel config?
Thank you for your efforts and, if appropriate, merry Christmas.
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https://bugs.launchpad.net/bugs/1805079
Title:
click/pop noise in the headphone on several lenovo laptops
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