[Bug 2121289] Re: Add support for Latitude 5455

[Jörg Stucke]

Hi, I have a Latitude 5455 but with x1p42100 ("purwa") CPU and got it to run with a lot of tinkering and this guide:
https://github.com/3thanRam/DELL-Latitude-5455-Ubuntu/blob/main/README.md

I was able to boot into a live session of the concept build (questing-
desktop-arm64+x1e-20260119) using this minimal device tree:

<details>

```dts
/dts-v1/;

#include "purwa.dtsi"
#include "x1-dell-thena.dtsi"

/delete-node/ &pmc8380_6;
/delete-node/ &pmc8380_6_thermal;

/ {
	model = "Dell Latitude 5455";
	compatible = "dell,latitude-5455", "qcom,x1p42100";
	chassis-type = "laptop";
};

&gpu {
	status = "disabled";
};

&remoteproc_adsp {
	status = "disabled";
};

&remoteproc_cdsp {
	status = "disabled";
};

&iris {
	status = "disabled";
};
```

</details>

>From there I was able to extract some firmware from the windows
partition and boot with the attached device tree.

What does seem to work:
- WiFi
- Media buttons (with the exception of brightness +/-)
- GPU acceleration
- battery
- USB
- Keyboard/Touchpad
- Bluetooth

What currently does not work:
- Sound
- the webcam
- actually installing Ubuntu (the Release.gpg key seems to be missing from the test build I used and if I boot with GPU firmware enabled, the installer window won't open for whatever reason)

I still get some weird messages like "Unknown battery technology 'LiP'"
in the kernel log but it is mostly error free.

Is there something I can do to support development for this device?

** Attachment added: "x1p42100-dell-latitude-5455_v4.dts"
   https://bugs.launchpad.net/ubuntu-concept/+bug/2121289/+attachment/5950289/+files/x1p42100-dell-latitude-5455_v4.dts

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to ubuntu-concept.
https://bugs.launchpad.net/bugs/2121289

Title:
  Add support for Latitude 5455

Status in ubuntu-concept:
  New

Bug description:
  I have a Dell Latitude 5455. It has the X1P64100 cpu. I have managed
  to get it booted into Unbuntu Concept 20ually internal SSD)250821 by
  copying and renaming the Dell Latitude 7455 DTS files and Copying the
  MD5 signatures to the new name on the install disk. After booting
  fine, I installed to local drive. After running qcom-firmware-extract,
  it appears everything is running except sound and being correctly
  listed in about. About shows it as Dell Inc. Latitude 5455 with
  Adreno-X1-85 graphics but CPU is blank. It is showing  the kernel as
  Linux 6.16.0-26-qcom-x1e and firmware version as 2.11.0. I am more
  than willing to pull any further info you need.

  Thank you,
  Josh

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-concept/+bug/2121289/+subscriptions