Eventually I came across the post about the laptop Lenovo Yoga C940 which I suppose is quite similar to S940. It suggested to use Sound Open Firmware (SOF). Even though the post suggested that one needs kernel 5.5 for me it worked with default 5.3.0-29-generic. SOF support should be enabled in the kernel. To check if current kernel supports SOF run
cat /boot/config-`uname -r` | grep SOF
and see if CONFIG_SND_SOC_SOF_INTEL_TOPLEVEL=y
One also need to download the sof firmware and put it into /lib/firmware/intel/sof/. In my case there already was a file sof-cnl.ri.
I got the latest version (1.4.2) from https://github.com/thesofproject/sof/releases/ (file sof-cnl-v1.4.2.ri, cnl stands for cannon lake) and copied it to /lib/firmware/intel/sof/sof-cnl.ri
I added two lines into /etc/modprobe.d/blacklist.conf:
blacklist snd_hda_intel
blacklist snd_soc_skl
after next reboot my laptop switched to SOF. Sound was working but still no subwoofer. Microphone was detectable now but was not working. Interestingly microphone registered input when headphone jack was plugged in and music was on.
I came across another post about SOF and lenovo hardware by DaveOber.
I took following configuration from his instruction:
First create a directory /usr/share/alsa/ucm/sof-skl_hda_card/.
Put following text into /usr/share/alsa/ucm/sof-skl_hda_card/HiFi:
# Use case Configuration for skl-hda-card
SectionVerb {
EnableSequence [
cdev "hw:sofsklhdacard"
cset "name='Master Playback Switch' on"
cset "name='Capture Switch' on"
]
DisableSequence [
cdev "hw:sofsklhdacard"
]
Value {
}
}
SectionDevice."HDMI1" {
Comment "HDMI1/DP1 Output"
# ConflictingDevice [
# "Headset"
# ]
EnableSequence [
cdev "hw:sofsklhdacard"
cset "name='hif5-0 Jack Switch' on"
cset "name='Pin5-Port0 Mux' 1"
]
DisableSequence [
cdev "hw:sofsklhdacard"
cset "name='Pin5-Port0 Mux' 0"
cset "name='hif5-0 Jack Switch' off"
]
Value {
PlaybackPCM "hw:0,3"
PlaybackChannels "2"
JackControl "HDMI/DP, pcm=11 Jack"
# JackHWMute "Headset"
}
}
SectionDevice."HDMI2" {
Comment "HDMI2/DP2 Output"
# ConflictingDevice [
# "Headset"
# ]
EnableSequence [
cdev "hw:sofsklhdacard"
cset "name='hif6-0 Jack Switch' on"
cset "name='Pin6-Port0 Mux' 2"
]
DisableSequence [
cdev "hw:sofsklhdacard"
cset "name='Pin6-Port0 Mux' 0"
cset "name='hif6-0 Jack Switch' off"
]
Value {
PlaybackPCM "hw:0,4"
PlaybackChannels "2"
JackControl "HDMI/DP, pcm=12 Jack"
# JackHWMute "Headset"
}
}
SectionDevice."HDMI3" {
Comment "HDMI3/DP3 Output"
# ConflictingDevice [
# "Headset"
# ]
EnableSequence [
cdev "hw:sofsklhdacard"
cset "name='hif7-0 Jack Switch' on"
cset "name='Pin7-Port0 Mux' 3"
]
DisableSequence [
cdev "hw:sofsklhdacard"
cset "name='Pin7-Port0 Mux' 0"
cset "name='hif7-0 Jack Switch' off"
]
Value {
PlaybackPCM "hw:0,5"
PlaybackChannels "2"
JackControl "HDMI/DP, pcm=13 Jack"
# JackHWMute "Headset"
}
}
SectionDevice."Headphone" {
Comment "Headphone"
#ConflictingDevice [
# "Speaker"
#]
EnableSequence [
cdev "hw:sofsklhdacard"
cset "name='Headphone Playback Volume' 80"
#cset "name='Headphone Mic Boost Volume' 1"
cset "name='Headphone Playback Switch' on"
]
DisableSequence [
cdev "hw:sofsklhdacard"
cset "name='Headphone Playback Switch' off"
]
Value {
PlaybackPCM "hw:sofsklhdacard,0"
PlaybackChannels "2"
#JackHWMute "Speaker"
JackName "sof-skl_hda_card Headphone"
JackType "gpio"
JackSwitch "12"
JackControl "Headphone Jack"
}
}
SectionDevice."Speaker" {
Comment "Speaker"
#ConflictingDevice [
# "Headphone"
#]
EnableSequence [
cdev "hw:sofsklhdacard"
cset "name='Speaker Playback Switch' on"
cset "name='Speaker Playback Volume' 80"
]
DisableSequence [
cset "name='Speaker Playback Switch' off"
]
Value {
PlaybackPCM "hw:sofsklhdacard,0"
JackHWMute "Headphone"
PlaybackChannels "2"
}
}
SectionDevice."Bass Speaker" {
Comment "Bass Speaker"
# ConflictingDevice [
# "Headphone"
# ]
EnableSequence [
cdev "hw:sofsklhdacard"
cset "name='Bass Speaker Playback Switch' on"
cset "name='Speaker Playback Switch' on"
cset "name='Speaker Playback Volume' 80"
]
DisableSequence [
cset "name='Speaker Playback Switch' off"
cset "name='Bass Speaker Playback Switch' off"
]
Value {
PlaybackPCM "hw:sofsklhdacard,0"
JackHWMute "Headphone"
PlaybackChannels "2"
}
}
SectionDevice."Headset" {
Comment "Headset Mic"
ConflictingDevice [
"DMIC Stereo"
]
EnableSequence [
cdev "hw:sofsklhdacard"
# cset "name='Headphone Mic Boost Volume' 1"
# cset "name='Capture Switch' on"
]
DisableSequence [
cdev "hw:sofsklhdacard"
# cset "name='Capture Switch' off"
]
Value {
CapturePCM "hw:0,0"
CaptureChannels "2"
JackControl "Mic Jack"
# JackHWMute "DMIC Stereo"
}
}
SectionDevice."Dmic" {
Comment "DMIC Stereo"
ConflictingDevice [
"Headset Mic"
]
EnableSequence [
cdev "hw:sofsklhdacard"
# cset "name='Capture Switch' on"
cset "name='PGA10.0 10 Master Capture Volume' 75"
]
DisableSequence [
cdev "hw:sofsklhdacard"
# cset "name='Capture Switch' off"
]
Value {
CapturePCM "hw:0,6"
CaptureChannels "2"
# JackHWMute "Headset Mic"
}
}
Whenever I was plugging and unplugging headphones my system would switch to the last device which in Dave's confing was HDMI, so I rearranged the entries and put HDMI entries higher, now I always have Bass Speaker as a default one.
and put there
SectionUseCase."HiFi" {
File "HiFi"
Comment "Play HiFi quality Music"
}
Now you can run
pulseaudio --kill; sudo alsactl kill rescan; pulseaudio --start
and enjoy working microphone and subwoofer. You can compare the sound when you choose Speaker or Bass Speaker as a sound device. The difference is stunning.
I also added two lines to /etc/pulse/daemon.conf
enable-lfe-remixing = yes
lfe-crossover-freq = 250
It is hard to say it is doing anything though.
The last issue is that whenever I plug and unplug headphones volume in alsamixer goes to 35. Have not solved this issue yet.
I also noticed that there was some hissing from the speakers. I could solve it by changing microphone gain in alsamixer to zero. Interestingly microphone still works, but whenever I run the app which uses microphone hissing reappears. Hope it will be properly solved in the next versions of the driver.
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