[Bug 2084191] Re: [X1E] Request: Add support for Lenovo Yoga Slim 7x

[Carlo Lazzerini]

@Deepesh

Copying over the firmware cdsp_dtbs.elf from windows using the
instructions below reduced the audio glitch on the rear speakers enough
to be vary usable for me (almost non-existent).

Process (super user mode ... "sudo su -"):

1) mount your windows partition using files and supplying your bitlocker
key if necessary.  It mounts to "/run/media" now in ubuntu 26.04

2) in a terminal go to <windows mount
point>/Windows/System32/DriverStore/FileRepository/

3) execute 'find . | grep cdsp_dtbs.elf'

4) if two files are listed use the newer file location
eg. su 
-rwxr-xr-x+ 1 carlo carlo 40760 Jun  3  2025 ./qcnspmcdm_ext_cdsp8380.inf_arm64_a2e536ad01025a78/cdsp_dtbs.elf*
-rwxr-xr-x+ 1 carlo carlo 24376 May 23  2024 ./qcsubsys_ext_cdsp8380.inf_arm64_e670966abf20c5bf/cdsp_dtbs.elf*

5) cd to "/lib/firmware/qcom/x1e80100/LENOVO/83ED/"

6) cp the windows file identified to the directory
"/lib/firmware/qcom/x1e80100/LENOVO/83ED/"

7) chmod the cdsp_dtbs.elf file to 644

8) compress the file just in case "zstd ./grep cdsp_dtbs.elf"

9) chmod the new cdsp_dtbs.elf.zst file to 644

10) update your intitramfs with "update-initramfs -kall -u"

11) reboot

12) your system dmesg log should no longer have any errors showing
cdsp_dtbs load failures and your rear sound should be slightly better

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https://bugs.launchpad.net/bugs/2084191

Title:
   [X1E] Request: Add support for Lenovo Yoga Slim 7x

Status in ubuntu-concept:
  Confirmed

Bug description:
  Add support for the Snapdragon X Elite powered Lenovo Yoga Slim 7x

  === Device Information ===

  Manufacturer: LENOVO
  Product Name: 83ED
  Version: Yoga Slim 714Q8X9

  === Kernel + DTB ===

  Live environment and installation work.

  === Known Issues ===

  1) Unable to boot with secure boot enabled
  Workaround: Disable secure boot using FN+F2 during device boot

  2) Blank screen on installer boot up
  Workaround: Restart manually with power button. May take up to 2 reboots to resolve.

  3) Initial GNOME installer window broken/flickering
  Workaround: set display scale to 100% (settings->displays)

  4) Install along side Windows fails on Bitlocker enabled error
  Workaround: Reboot and install with manual partitioning

  5) Keyboard not functioning in Grub boot menu post installation
  Fix: See possible and unverified fix in comment from Carlo Lazzerini dated 2024-10-21
  Workaround: Wait for the time to run out and the default (Ubuntu) item will execute. Use FN+F12 to pick between Windows/Ubuntu using BIOS boot menu

  6) Video card functioning slowly and battery indicator not working
  Fix: install firmware with qcom-firmware-extract manually

  7) Firmware install failing with Bitlocker encrypted Windows volumn
  Workaround: Manually mount Windows volume with GNOME Files app

  7) Bluetooth not functioning
  Fix: None

  8) Sound not functioning
  Fix: None for laptop
  Workaround) Attach an external audio device (eg. usb headphones)

  9) External display not detected
  Fix: None

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