AMD Brings HDMI 2.1 Low-Latency Gaming Features to Linux Radeon Driver
Key Takeaways
- ▸AMD posts open-source patches enabling HDMI 2.1 Auto Low-Latency Mode in the AMDGPU Linux driver
- ▸ALLM enables "Game Mode" activation on displays for reduced latency during gaming
- ▸HDMI 2.1 Variable Rate Refresh support added, matching DisplayPort VRR capability
Summary
AMD has posted new patches for its open-source AMDGPU Linux driver, adding support for HDMI 2.1 Auto Low-Latency Mode (ALLM) and Variable Rate Refresh (VRR). These features enhance the gaming experience by enabling displays to optimize for faster, lower-latency performance when gaming content is detected.
HDMI ALLM allows AMD Radeon GPUs to communicate with compatible displays, instructing them to activate "Game Mode" for optimized gaming performance. The feature works either when gaming content is explicitly set by user-space requests or when HDMI 2.1 Gaming-VRR is enabled. Alongside ALLM, the patches add support for HDMI 2.1 Variable Rate Refresh, which synchronizes refresh rates with frame rates to reduce screen tearing and stuttering—a feature that Linux users with AMD Radeon graphics have long been able to enjoy over DisplayPort.
The patches represent the latest milestone in AMD's ongoing effort to deliver comprehensive HDMI 2.1 support on Linux. Previous implementations included HDMI 2.1 Full Rate Link (FRL) support and Display Stream Compression (DSC). The community review period is underway, with hopes to merge the patches into the upcoming Linux v7.3 kernel cycle, though a shift to v7.4 remains possible depending on the DRM subsystem merge window timeline.
- Features undergoing community review for potential inclusion in Linux v7.3 kernel
