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).
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 (e.g., with mplayer).
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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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