Omarchy 4.0.4 installs its custom linux-omarchy kernel by default on Arch-based systems

Omarchy 4.0.4 introduces a significant architectural shift by making its proprietary linux-omarchy kernel the default installation choice. This package is not merely a renamed Arch kernel but is built from the project's own source repository, indicating a deeper level of customization and control over the system's core. The release includes matching headers, ensuring that users can compile kernel modules against the specific version they are running.

The primary motivation for this switch is performance tuning, specifically targeting desktop responsiveness and multitasking smoothness under heavy load or memory pressure. The developers claim the kernel improves gaming compatibility and smooths performance on supported AMD HDMI displays. These optimizations are particularly relevant for the target audience of a desktop-focused Arch derivative, where out-of-the-box usability is a key selling point.

Filesystem performance is another major focus, with the new kernel speeding up common Btrfs operations. Since Omarchy extensively uses Btrfs in its default setup, including snapshots integrated with Snapper and the Limine bootloader, these kernel-level improvements directly enhance the reliability and speed of the distro's core data management features. This tight integration suggests the kernel is tailored specifically for the Omarchy environment rather than being a generic performance patch.

Hardware compatibility fixes are also a significant part of this release, addressing issues like missing audio, unresponsive touchpads, and display freezes. A specific fix for webcams on Dell XPS systems running Linux 7.2.x is highlighted in the release notes. These targeted patches suggest that the custom kernel is being used to resolve specific driver or firmware issues that the standard Arch kernel may not address promptly or effectively for these hardware configurations.

Adopting this kernel means users are moving away from the standard Arch kernel maintenance cycle to a project-specific one. While this offers tailored fixes and optimizations, it also ties the user's system stability to the Omarchy project's development pace and priorities. Existing users can upgrade through the system's update mechanism, after which linux-omarchy becomes the preferred boot kernel on supported systems, excluding T2 Macs which retain their specialized kernel.