Valve: HDMI Forum Continues to Block HDMI 2.1 for Linux
HDMI 2.1 on Linux and Valve’s Problem
- Core issue: HDMI Forum’s HDMI 2.1 license/NDAs forbid an open-source implementation, so AMD cannot upstream its working HDMI 2.1 support into Linux.
- Closed drivers (e.g., firmware/user‑space blobs) can legally implement it; Nvidia already does this by moving sensitive parts into firmware.
- Some suggest AMD/Valve could ship a tiny proprietary HDMI 2.1 blob or GSP‑style firmware, but that conflicts with Valve’s preference for fully open drivers.
- Several commenters note that for the new Steam Machine’s GPU, HDMI 2.0 bandwidth is “good enough” for many games, but lack of VRR and full 4K120 HDR is still a major loss for living‑room gaming.
DisplayPort vs HDMI and the TV Ecosystem
- Many argue DisplayPort is technically and economically superior (no per‑device royalties, earlier high‑refresh support, royalty‑free spec access via VESA fee), and want HDMI “gone.”
- Frustration that TVs almost never ship with DisplayPort; some claim HDMI Forum discourages DP on TV SoCs, others say it’s mainly cost, SoC bandwidth limits, and negligible consumer demand.
- Mass‑market inertia: consoles, streamers, and set‑top boxes are all HDMI‑only, so TV makers see little reason to expose DP even if they dislike HDMI royalties.
- DP has its own issues (short passive cable runs, fiber cost), and CEC/eARC equivalents are weaker or fragmented.
Workarounds and Adapters
- Common suggestion: DP→HDMI 2.1 active adapters (Club3D, Cable Matters, VMM7100, etc.) or USB‑C docks.
- Mixed reports: some users achieve 4K120, HDR, and even VRR/Freesync with specific adapters and custom firmware; others say no adapter reliably delivers 4:4:4 + HDR + VRR + 4K120 without glitches.
- Many point out adapters usually don’t officially support VRR, and firmware quality is hit‑or‑miss.
Legal, DRM, and Standards Politics
- Heated debate over IP: some see HDMI Forum as a rent‑seeking cartel akin to scientific publishers; others defend “they own the IP, they can charge.”
- Distinction raised between patents (FRAND pools), branding/certification (use of “HDMI 2.1” name/logo), and trade secrets/NDAs.
- Clean‑room reverse engineering and anonymous/open‑source implementations are discussed; consensus is they’d be risky for companies but plausible for hobbyists, especially if marketed as “HDMI‑compatible” rather than certified.
- Several call for laws requiring public, royalty‑free standards for de‑facto infrastructure technologies.
Smart TVs, “Dumb” Displays, and a Possible Steam TV
- Strong resentment toward smart TV OSes (ads, forced launchers, unremovable apps like Copilot, pop‑ups).
- Popular coping strategies:
- Buy a TV, update once, disconnect from internet, use external box (Apple TV, Roku, etc.).
- Avoid TVs entirely and use large monitors or projectors, though size, cost, and refresh‑rate constraints apply.
- Many express interest in a “Steam TV” or at least a high‑end, dumb, gamer‑focused display with VRR/HDR and open specs, but some warn that integrated compute ages faster than panels and prefer a separable box + display model.