Linux 7.4 kernel adds HDMI 2.1 DSC support for Nouveau and FreeSync fixes for AMD

The Linux 7.4 kernel cycle will introduce two distinct HDMI-related improvements through DRM-Misc-Next changes. For Nouveau, the open-source NVIDIA driver, HDMI 2.1 Display Stream Compression (DSC) support enables more efficient transmission of high-resolution video signals. This reduces bandwidth requirements for 4K/8K displays and high-refresh-rate content, though actual performance depends on GPU hardware capabilities and display compatibility.

AMD's contribution focuses on FreeSync fixes within the AMDGPU driver. These changes address variable refresh rate functionality over HDMI connections, which should reduce screen tearing and stuttering during gaming or video playback. The fixes are particularly relevant for users relying on open-source drivers rather than AMD's proprietary alternatives, though the specific nature of the fixes remains unspecified in the available material.

Both updates target the DRM-Next branch for inclusion in Linux 7.4, indicating they've passed initial review stages. The Nouveau DSC implementation may face limitations on older NVIDIA hardware lacking HDMI 2.1 support, while AMD's FreeSync fixes could require specific display models to demonstrate noticeable improvements. These changes reflect ongoing efforts to improve Linux's out-of-the-box support for modern display technologies without proprietary drivers.