The big news for Linux gamers is the implementation of advanced options for the in-game performance overlay for AMD and NVIDIA GPUs, improved Steam UI scaling in XWayland, improved system display scale in the in-game overlay, and improved Big Picture update progress UI.
Coming a little over a month after KDE Plasma 6.4.4, the KDE Plasma 6.4.5 release adds a workaround for brightness flickering issues with the AMD GPU graphics drivers when changing GAMMA_LUT often. The workaround can be disabled by setting the KWIN_DRM_DISABLE_AMD_GAMMA_WORKAROUND variable to 1.
As you can expect, Kodi 22 will be a major release promising exciting new features for Linux users, including the long-anticipated HDR support on Wayland for compatible Wayland compositors, thanks to the addition of support for the Wayland Color Management protocol, and HDR passthrough support on OpenGL.