How BoppOS differs from Bazzite

While this image is based on Bazzite-dx, it uses the CachyOS kernel and a specific set of kernel arguments to prioritize gaming latency and hardware control for AMD users:

• Kernel Preemption: Set to full. This makes the system more responsive during heavy CPU load, prioritizing game frames over background tasks.
• Memory Management: Uses transparent_hugepage=madvise. This gives a performance boost to games and apps that support huge pages without the high RAM overhead of the always setting.
• AMD Optimizations: Includes iommu=pt for better DMA performance and amdgpu.ppfeaturemask=0xffffffff so you can undervolt or overclock your GPU using tools like LACT.
• Compatibility: Disables split_lock_detect to prevent performance drops in older game engines that can trigger kernel-level slowdowns.
• Extra Drivers: Includes xone and xpad-noone for Xbox controller support, and the KVMFR module for Looking Glass users.

Secure Boot

Since this uses the CachyOS kernel, I’ve included a custom signing system so that Secure Boot remains functional even with these custom modules. The kernel and modules are signed with a private key; you can enroll the keys using:

ujust enroll-secure-boot-keys

Optional Virtualization Extras

I've included some optional configurations in /usr/share/boppos/unused_files for users who need advanced virtualization features like Looking Glass (KVMFR) or Nested Virtualization. These are disabled by default to keep the core image lean and avoid issues with some anti-cheat systems.

Activating Extras

To enable these features, you can use the built-in ujust command:

ujust setup-kvm-extras

Performance Toggling

BoppOS defaults to preempt=full for the lowest gaming latency. If you need a different balance, you can switch modes instantly without a reboot:

ujust toggle-preempt

Installation

Warning

This is an experimental feature, try at your own discretion.

To rebase an existing atomic Fedora installation to the latest build:

• First rebase to the unsigned image, to get the proper signing keys and policies installed:

  rpm-ostree rebase ostree-unverified-registry:ghcr.io/ripps818/boppos-bluebuild:latest
  

• Reboot to complete the rebase:

  systemctl reboot
  

• Then rebase to the signed image, like so:

  rpm-ostree rebase ostree-image-signed:docker://ghcr.io/ripps818/boppos-bluebuild:latest
  

• Reboot again to complete the installation

  systemctl reboot
  

The latest tag will automatically point to the latest build. That build will still always use the Fedora version specified in recipe.yml, so you won't get accidentally updated to the next major version.

Verification

These images are signed with Sigstore's cosign. You can verify the signature by downloading the cosign.pub file from this repo and running the following command:

cosign verify --key cosign.pub ghcr.io/ripps818/boppos-bluebuild