(In reply to DavidLenovo from comment #120)
> Hi !
> A man have find the solution for the Yoga 7 - Yoga 7i - 14ITL5 & 14ITL05 &
> 15ITL05 & 15ITL5 :)
> Sound from speakers works on Ubuntu 20.04.2LTS !!!
> 
> (In reply to gurpreetsinghwalia5 from comment #86)
> > (In reply to juliusvonkohout from comment #85)
> > > (In reply to gurpreetsinghwalia5 from comment #84)
> > > > I have a lenovo yoga 7i. No sound from the in build speaker in ubuntu
> > > 20.10.
> > > > Is there a solution for this ???
> > > 
> > > Yes, install fedora 33 and update everything. Then at least the bottom
> > > speakers will work.
> > 
> > Is there a debian distro that works ??? Need debian for work.
> 
> It work on Ubuntu so will work on Debian.
> 
> 
> (In reply to Priyaranjan Sharma from comment #98)
> > I don't have any sound on my Lenovo Yoga 7i 15" with Fedora 33. 
> > Tried Suse, Ubuntu and Mint as well and it is same result.
> 
> 
> (In reply to esanchez from comment #110)
> > Hi, 
> > 
> > Same error with Lenovo Yoga 7i 14"intel.
> > Tested with Ubuntu 20.04LTS and Ubuntu 21.04 and no sound from internal
> > speakers, meanwhile the headphones works perfectly.
> 
> 
> 
> (In reply to chenyh570 from comment #104)
> > (In reply to wave from comment #100)
> > > Did anyone else with the problem try my "workaround" from comment #97?
> It's
> > > actually not too bad, I just suspend whenever I need audio from my
> speakers
> > > and play some music muted in the background in a loop to keep it alive in
> > > case playback is interrupted. Not perfect but usable.
> > 
> > I have 14inch yoga 7i, and unfortunately it doesn't work for me. I am
> > running 5.10 kernel
> 
> 
> 
> (In reply to lazertag from comment #116)
> > Just wanted to join in on the bandwagon here and follow any possible
> > progress.  Look forward to hearing sound from my laptop speakers someday in
> > Ubuntu. ;)
> > 
> > Lenovo Yoga 7-14ITL5 model # 82BH0006US
> > 
> > Like others my headphones via 1/8 jack seem to work fine but not a lick of
> > sound from the built in speakers.  Lots of trying suggestions noted
> > throughout this thread to no avail. Playing sound while selected on
> speakers
> > it looks like there is activity just no sound of course.
> > 
> > hdaJackRetask seems to not work at all on my unit and hangs quite often
> > where you have to force quit.  I was hopeful trying to use it might find
> > some workaround. Anyway not sure if that says anything about the issue.
> 
> 
> 
> The problem is to enable the S3 :
> Try : cat /sys/power/mem_sleep
> You will have : "S2idle [deep]" 
> Try : sudo dmesg |grep ACPI|grep supports
> You will have : [    0.195933] ACPI: (supports S0 S3 S4 S5)
> 
> If not, you will check how to enable S3 :
> ==== ENABLE S3 ====
> We have to patch the DSDT table
> 1) Install iasl : 
> sudo apt-get install acpica-tools cpio
> 
> 2) make acpi directory
> mkdir acpi
> 
> 3) Get a dump of ACPI DSDT table: 
> sudo cat /sys/firmware/acpi/tables/DSDT > dsdt.aml
> 
> 4) Decompile the dump, which will generate a .dsl source based on the .aml
> ACPI machine language dump : 
> iasl -d dsdt.aml
> 
> 5) Make the patch file
> The patch is just for Yoga 7/7i :
> nano acpi.patch
> --- dsdt.dsl~    2018-04-26 09:35:29.501055509 -0600
> +++ dsdt.dsl    2018-04-26 09:36:23.769729028 -0600
> @@ -18,7 +18,7 @@
>   *     Compiler ID      "INTL"
>   *     Compiler Version 0x20210105 (539033861)
>   */
> -DefinitionBlock ("", "DSDT", 2, "LENOVO", "CB-01   ", 0x00000002)
> +DefinitionBlock ("", "DSDT", 2, "LENOVO", "CB-01   ", 0x00000003)
>  {
>      External (_GPE.AL6F, MethodObj)    // 0 Arguments
>      External (_GPE.P0L6, MethodObj)    // 0 Arguments
> @@ -516,7 +516,7 @@
> 
>      Name (SS1, Zero)
>      Name (SS2, Zero)
> -    Name (SS3, Zero)
> +    Name (SS3, One)
>      Name (SS4, One)
>      OperationRegion (GNVS, SystemMemory, 0x45AB8018, 0x0A9B)
>      Field (GNVS, AnyAcc, Lock, Preserve)
> 
> 6) Apply it against dsdt.dsl: patch --verbose < acpi.patch
> You will have :
> Hunk #1 succeeded at 18 with fuzz 2.
> Hunk #2 succeeded at 516.
> done
> (not sure because I'm already done it) Could anybody confirm the message,
> please ?
> 
> 7) Recompile your patched version of the .dsl source : 
> iasl -ve -tc dsdt.dsl
> 
> 8) Create a CPIO archive with the correct structure, which GRUB can load on
> boot. We name the final image acpi_override and copy it into /boot/ : 
> mkdir -p kernel/firmware/acpi
> cp dsdt.aml kernel/firmware/acpi
> find kernel | cpio -H newc --create > acpi_override
> cp acpi_override /boot
> 
> 9) GRUB needs to boot the kernel with a parameter setting the deep sleep
> state as default. Edit /etc/default/grub and add the following :
> GRUB_CMDLINE_LINUX_DEFAULT="mem_sleep_default=deep"
> GRUB_EARLY_INITRD_LINUX_CUSTOM="/boot/acpi_override"
> 
> 10) Regenerate the GRUB configuration : 
> sudo update-grub
> 
> If the second line of the previous step does not generate the grub to make
> the initrd lines look like "initrd /boot/acpi_override" in the beginning,
> then follow the next steps as normal. If it does generate those lines, skip
> to step 12. For me on Ubuntu it's not like this.
> 
> 11) Tell GRUB to load the new DSDT table on boot in its configuration file
> usually located in /boot/grub/grub.cfg. Find the relevant GRUB menu entry
> and add the new image /boot/acpi_override to the initrd lines for the images
> that you want the s3 sleep to work in : 
> sudo nano /boot/grub/grub.cfg
> initrd /boot/initrd.img-5.11.5-051105-generic 
> BECOME :
> initrd /boot/acpi_override /boot/initrd.img-5.11.5-051105-generic
> 
> Be sure to do it for all kernels !
> 
> 12) Reboot and enjoy having a laptop running Linux again... close the lid
> and the battery does not get drained in a few hours, also the battery no
> longer stays warm in sleep mode. To verify that things are working :
> Try : cat /sys/power/mem_sleep
> You will have : "S2idle [deep]" 
> Try : sudo dmesg |grep ACPI|grep supports
> You will have : [    0.195933] ACPI: (supports S0 S3 S4 S5)
> 
> 
> After we have to enable sound :
> ==== ENABLE SOUND ====
> For me on Ubuntu 20.04, I have to use kernel 5.11.0 to 5.11.5, 5.11.6 don't
> work, 5.11.16 don't work to. Anybody say why ?
> So I sugest to try with 5.11.5 :
> https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.11.5/.
> After could you try with you kernel, and share your kernel version, please ?
> 
> You will don't have dummy out.
> For me :
> aplay -l
> gives :
> **** Liste des Périphériques Matériels PLAYBACK ****
> carte 0: sofhdadsp [sof-hda-dsp], périphérique 0: HDA Analog (*) []
> 
> sudo dmesg | grep -i audio
> gives : sof-audio-pci 
> 
> If it is ok, just have to :
> - play a song on VLC
> - suspend to ram
> - power on
> - the speakers work :)
> 
> Like it is say, if you stop for 7 seconds, sound stop working.
> 
> Work after many reboot.
> 
> Ubuntu 21.04 live USB have jack/headphone work directly, so I think we have
> just enable the S3 for it.
> 
> Working for you ?
> 
> Original tutorial : https://wiki.archlinux.org/title/Lenovo_Yoga_7i
> French tutorial on Ubuntu 20.04 : https://doc.ubuntu-fr.org/lenovo_yoga_7_7i

Wondeful news to me, basically it works. Yet, I was trying to make this as automatic as possible, so I was trying the bash script as descipt in the tutorial. Hower it keeps throwing: tee: /dev/audio: Connection refused to me. Do you know what is this about? Cheers!