(In reply to wave from comment #140)
> (In reply to Vincent Morel from comment #137)
> > (In reply to DavidLenovo from comment #134)
> > > (In reply to Vincent Morel from comment #130)
> > > > (In reply to DavidLenovo from comment #127)
> > > > > (In reply to Vincent Morel from comment #125)
> > > > > > On the 13S Gen 2, there is only 2 speakers, and S3 is activated...
> > > > > 
> > > > > Hi, I have similar result in hwinfo --sound, but it's not exactly the
> > > same
> > > > > card.
> > > > > 
> > > > > Your have only 2 speakers working ? Ore no one ?
> > > > > 
> > > > > You have try Ubuntu 20.04 with kernel 5.11.5 ?
> > > > 
> > > > No speaker working (but headphone, hdmi... are working).
> > > > 
> > > > I did not try kernel 5.11.5 (My Pop Os is in 5.11.0 but I remember
> trying
> > > > Ubuntu 21.04 and there was no sound also).
> > > 
> > > (In reply to Vincent Morel from comment #132)
> > > > (In reply to DavidLenovo from comment #127)
> > > > > (In reply to Vincent Morel from comment #125)
> > > > > > On the 13S Gen 2, there is only 2 speakers, and S3 is activated...
> > > > > 
> > > > > Hi, I have similar result in hwinfo --sound, but it's not exactly the
> > > same
> > > > > card.
> > > > > 
> > > > > Your have only 2 speakers working ? Ore no one ?
> > > > > 
> > > > > You have try Ubuntu 20.04 with kernel 5.11.5 ?
> > > > 
> > > > Just tried with kernel 5.11.5... No luck...
> > > > 
> > > > How ACL3306 not recognise, can we find some spec or information about
> it?
> > > > Seems Realtek codec information is nowhere to be found... :(
> > > 
> > > Could you recheck, please :
> > > cat /sys/power/mem_sleep
> > > 
> > > sudo dmesg |grep ACPI|grep supports
> > > 
> > > Do you have try, to play a long sound with VLC, y choose PulseAudio
> Server
> > > if it is available, on another session I just have sof-hda-dsp Speaker +
> > > Headphone (it work on both). If your change the sound output, stop and
> > > restart the sound.
> > > Let the sound playing and put in sleep, put the computer on, and the
> sound
> > > work. It lagging for me at the beginning, and after few seconds it is ok.
> > > 
> > > You have ALC287 or ALC3306 ? You seem to have ALC3306, no ?
> > > Not sure Ubuntu is work well for it.
> > > 
> > > I think your problem is to enable S3. 
> > > It is probably not the same patch for you with you Lenovo Think Book 13s
> > Gen
> > > 2. The patch is for Yoga 7i 14" and 15"
> > > 
> > > The user Wave could you help me more I think, my knowledge is limited.
> > 
> > Sure thanks, here is my outputs! :)
> > cat /sys/power/mem_sleep
> > [s2idle] deep
> > 
> > sudo dmesg |grep ACPI|grep supports
> > [    0.242864] ACPI: (supports S0 S3 S4 S5)
> > 
> > VLC -> played long song, plugged headphone (sound on headphone works),
> > changing output to speaker, no sound (note that sound meter show sound in
> > preference, but sounds do not output to the speaker).
> > 
> > Put computer into sleep while playing. After resume, still no sound in
> > speaker...
> > 
> > I have ALC3306. The only "not Ubuntu" I tried was Calculate Linux (Gentoo).
> > I use PopOs, tried Ubuntu 21.04 also.
> > 
> > Only informations I found on the web always point back here.
> > 
> > Some infos: https://afterhourscoding.wordpress.com/tag/backlight/
> > And the kernel part:
> > https://github.com/torvalds/linux/blob/master/sound/pci/hda/patch_realtek.c
> > 
> > At this point I fear it's becoming little too hard for me, but I can still
> > try to do something. 
> > 
> > If I understand well this sentence 'According to Jaroslav Kysela Lenovo is
> > using amplifier chips for the integrated speakers on recent hardware which
> > must be initialized too. Much of that is undocumented.' we have to find a
> > way to initialize the amplifier chip...
> 
> For a quick test without having to change your grub config you can also run
> echo deep > /sys/power/mem_sleep
> as root and then try playing sound and hibernating again.

Thanks for all those precious infos! Just to make things more complicated, PopOs use systemd-boot and not grub.
Anyway I was able to activate 'deep' sleep with this command:

sudo kernelstub -a "mem_sleep_default=deep"

and after reboot I have:
cat /sys/power/mem_sleep
s2idle [deep]


But my computer is not able to exit from sleep now. It goes into deep sleep (I see the led in sleeping mode) but as soon as I press a key the computer turn off. I have to turn it on and it boots...

I also try to do it by adding mem_sleep_default=deep in /boot/efi/loader/entries/pop_OS-current.conf (that's where you put option in systemd-boot)

Same result... I'll try a totally different distribution when I have time (not ubuntu based) to see if I can do it.