AMD is set to introduce SmartMux technology in the upcoming Linux 6.17 kernel, marking a significant advancement in hybrid GPU support for laptops. This move is expected to enhance performance and efficiency for systems featuring both integrated and discrete GPUs.
SmartMux, a hardware-level GPU switching mechanism, enables seamless transitions between the integrated (APU) and discrete (dGPU) graphics processors based on workload intensity or power preferences. While already supported on Windows, Linux users will now benefit from improved scanout efficiency and reduced latency—especially during graphically demanding tasks such as gaming.
The patch description notes that SmartMux operates by directing the system’s display output through the most suitable GPU via a physical multiplexer on supported devices. This eliminates the need to copy graphical buffers between GPUs, resulting in lower frame latency and higher frame rates when the dGPU is active. Conversely, during lighter workloads or when battery life is prioritized, the system can revert to the integrated GPU for better power efficiency.
Alongside SmartMux integration, the Linux 6.17 release includes notable AMDGPU improvements, such as per-queue reset capabilities for newer GPU architectures (GFX9 and above), updated Image Signal Processor (ISP) components, System Management Unit (SMU) fixes, and display idle power management enhancements.
Additionally, the AMDKFD compute driver has been updated to support LoongArch systems, further extending AMD’s compatibility with emerging processor architectures.
These upgrades will roll out with the stable Linux 6.17 kernel release, expected in early October 2025. Distributions such as Ubuntu 25.10 and Fedora 43 are likely to include this update, offering a better out-of-the-box experience for AMD-powered hybrid laptops.
