Linux 7.2-rc1 Is Here — AMD Gets Native 4K/120Hz HDMI and the Kernel Hits 43 Million Lines

Linux 7.2-rc1 landed on June 28, 2026, with Linus Torvalds describing the merge window as "reasonably normal" — kernel mailing-list language for a clean, well-managed merge window with genuinely impactful changes. The headline addition is AMD HDMI 2.1 FRL support in the amdgpu driver, a long-overdue feature that finally brings the open-source driver in line with what RDNA 4 GPUs have been physically capable of for years.

AMD HDMI 2.1 FRL: What It Actually Changes

Until now, Linux users with AMD GPUs were effectively capped at HDMI 2.0 signaling through the open-source driver — 4K/60Hz maximum over HDMI, even on hardware designed for more. Linux 7.2-rc1 adds Fixed Rate Link (FRL) support, the HDMI 2.1 signaling technology that replaces older TMDS encoding. The practical result: AMD GPU owners on Linux can now drive uncompressed 4K at 120Hz, 8K at 60Hz, and true dynamic HDR over standard HDMI cables — no proprietary workarounds required.

This matters beyond gaming. Creators working with high-frame-rate 4K previews, anyone using a high-refresh HDR monitor over HDMI rather than DisplayPort, and TV-connected Linux setups all benefit from native support. The feature targets RDNA 4-era GPUs specifically, though related HDMI signaling improvements land across the amdgpu driver stack.

AMD ISP4: Webcam Quality Gets a Real Driver

The same release adds support for AMD's fourth-generation Image Signal Processor (ISP4), the dedicated hardware block that handles real-time camera image processing on AMD SoC platforms. On laptops powered by AMD chips, ISP4 is responsible for noise reduction, HDR stitching, and auto-focus — processing that previously required firmware workarounds or simply didn't function under Linux. Native ISP4 driver support means AMD-powered laptops should see immediate improvements in webcam quality through any standard application, without requiring vendor-specific software stacks.

Post-Quantum Signatures for Firmware Integrity

Linux 7.2-rc1 adds post-quantum ML-DSA signature support to the IMA (Integrity Measurement Architecture) and EVM (Extended Verification Module) subsystems. These components verify that boot-time firmware and loaded kernel modules haven't been tampered with. Adding ML-DSA — a lattice-based signature scheme standardized by NIST as part of its post-quantum cryptography project — means the kernel now supports signing and verification resistant to attacks from future quantum computers. For security-sensitive deployments in government, finance, and critical infrastructure, this is a practical, forward-looking addition that doesn't require waiting for a separate security patch.

strncpy Is Finally Out

One of the less-publicized but structurally significant changes is the complete removal of strncpy from the kernel codebase — the conclusion of a multi-year cleanup effort spanning over 360 individual patches. strncpy is a C function with notorious behavior: it doesn't null-terminate when the destination buffer is exactly the right size, and it zero-pads in ways that create subtle buffer overflow vulnerabilities. Eliminating it from the kernel removes an entire category of bug-prone code that has contributed to real CVEs over the years.

43 Million Lines and a Stable Release in August

The merge window pushed the Linux kernel source tree past 43 million lines — 43,179,595 by raw count, according to LinuxTeck's analysis. Linus noted the window was large but manageable, and the candidate cycle is expected to run eight weeks, with 7.2-rc2 due July 5 and a stable release projected around August 23, 2026.

That timeline puts Linux 7.2 in line to power Fedora 45 and Ubuntu 26.10 as their base kernel. For AMD GPU users in particular — especially anyone running a high-refresh monitor over HDMI or a laptop with a built-in webcam — 7.2 is the most meaningful kernel upgrade for AMD hardware in recent memory.