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I know that for such new hardware would be better to use a rolling release distro or at least the latest 22.10, but I was wondering if with some tinkering it is still possible to get the latest LTS to work.

As far as I know, to get a 7900 XTX to work on linux you need at least these:

  1. Kernel 6.x+
  2. LLVM 15+
  3. Mesa 22.3+
  4. latest linux-firmware for /lib/firmware/amdgpu/ (and rebuild initramfs)

Is it possible and, if yes, what would be the best way to achieve this on Ubuntu 22.04 LTS?

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2 Answers 2

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To get an AMD Radeon RX 7900 XT(X) to work with Ubuntu 22.04 LTS, you can follow these steps:

  1. Install the latest OEM kernel available by running the command:
sudo apt install linux-oem-22.04c
  1. Download and install the latest kernel firmware from here by running these commands:
wget https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/snapshot/linux-firmware-20230117.tar.gz
tar -xf linux-firmware-20230117.tar.gz
sudo cp linux-firmware-20230117/amdgpu/* /lib/firmware/amdgpu/
sudo update-initramfs -uk 'all'
  1. Install the kisak-mesa PPT by running these commands (this PPA will take care of providing the latest stable mesa and llvm15):
sudo add-apt-repository ppa:kisak/kisak-mesa
sudo apt upgrade
  1. Ensure there is no modprobe blacklist for amdgpu by running the command:
sudo rm /etc/modprobe.d/blacklist-amdgpu.conf

If you use Xorg instead of Wayland and have the issue where the mouse cursor is invisible, you can try to create the file /etc/X11/xorg.conf.d/99-modesetting.conf with the following content:

Section "Device"
      Identifier "modesetting"
      Driver "modesetting"
EndSection

This should make the latest LTS work with your hardware.

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  • For every apt install/upgrade operation, dkms tries to rebuild the driver wrapper and fails. This leaves me with a /etc/modeprobe.d/blacklist-amdgpu.conf after every apt operation pretty much.
    – MadMan2064
    Jan 27 at 2:39
  • I'm not experiencing this issue (just tested to ran apt update && apt upgrade). Do you have any other PPAs or dynamic kernel modules that may cause this?
    – Roberto Leinardi
    Jan 27 at 6:04
  • If you use the amdgpu primary drivers I believe they have a dkms component to it. 'amdgpu-install --usecase=graphics,....' The performance improvement is quite substantial.
    – MadMan2064
    Jan 28 at 2:51
  • What do you mean by "amdgpu primary drivers"? Do you mean the amdgpu-pro, the one that you download from the AMD website? Or are you talking about the open source amdgpu from Mesa? I'm using the latter and I never heard about this extra step. Can you please link some documentation about it?
    – Roberto Leinardi
    Jan 28 at 10:03
  • Performance goes up from 6kfps to 13kfps using the AMDGPU stack with glmark2. amdgpu-install.readthedocs.io/en/latest amd.com/en/support/linux-drivers
    – MadMan2064
    Jan 29 at 22:50
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As @MadMan2064 mentioned in the comments, amdgpu-install from https://www.amd.com/en/support/linux-drivers worked for me with a Radeon RX 7900 XT. Even though I'm on Ubuntu 22.10 (kinetic), the 22.04 version worked. I installed the .deb file and ran amdgpu-install without any arguments, and that was sufficient. No need to install a special kernel or add a ppa.

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