SteamVR + Padoka

!!! PPA end of support !!!

Hello, please be aware that this PPA is going to be retired, but I'll continue pushing kernel builds as long as the SteamVR Experimental build is targeting bionic.

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Kernel and X.org 1.20 to support AMD direct rendering to the Vive with Padoka PPA.

Have Padoka PPA added and confirmed working before adding this PPA!
(https://launchpad.net/~paulo-miguel-dias/+archive/ubuntu/mesa)

This PPA is only targeting mesa/amdgpu on Ubuntu 18.04.

While not required, it's a good idea to switch to an X based login manager like lightdm so that the Vive doesn't power up at user login time.

Steam package:

There are two commonly used variants of the steam package, the Valve-provided .deb from their website and the Ubuntu-provided package inherited from Debian. If you use the distro-packaged variant, add this symlink:
ln -s "$HOME"/.steam/ubuntu12_32 "$HOME"/.steam/steam/ubuntu12_32

Kernel bits:

sudo apt install linux-generic-steamvr-18.04

Xorg server bits:

Switch to xorg-server 1.20 with

sudo apt install xserver-xorg-core xserver-xorg-input-libinput xserver-xorg-video-amdgpu

Vulkan bits:

sudo apt install mesa-vulkan-drivers mesa-vulkan-drivers:i386

Move/remove /usr/share/vulkan/icd.d/intel_icd.x86_64.json to make sure SteamVR uses the AMD gpu. This may need to be redone on every mesa update.

sudo mv /usr/share/vulkan/icd.d/intel_icd.x86_64.json /usr/share/vulkan/icd.d/intel_icd.x86_64.json.disabled

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Removal:

sudo ppa-purge ppa:kisak/steamvr4pk
sudo apt install xserver-xorg-video-all