4k@120hz unavailable via HDMI 2.1 (#1417) · Issues · drm / amd · GitLab
gitlab.freedesktop.org
Brief summary of the problem: I have a RX 6800 XT connected to a LG B9 TV via HDMI. As both...

Alex Deucher:

The HDMI Forum has rejected our proposal unfortunately. At this time an open source HDMI 2.1 implementation is not possible without running afoul of the HDMI Forum requirements.

  • Eager EagleEnglish
    46•3 months ago

    So that means if we ever have an open source NVIDIA driver that matches the proprietary I won’t be able to connect my 4K screen @ 120hz via HDMI (as the only option) because made up rules by an HDMI faction of TV manufacturers say so?

    yup, we need brands making TVs with DisplayPort.

    UPDATE

    Even though AMD might not be able to add support for HDMI 2.1, nouveau certainly will as Nvidia’s open source driver also supports HDMI 2.1 so there is no reason to believe that at least some drivers can’t support HDMI 2.1. It’s quite backwards, but apparently having all the logic inside firmware (like Nvidia does) will probably help us implementing support for HDMI 2.1 🙃"

    https://www.phoronix.com/news/NVIDIA-Firmware-Blobs-HDMI-2.1

    • AtemuOP
      6•3 months ago

      Depends on how the cards implement HDMI. Intel cards notably have a DP->HDMI converter chip on-board requiring no software-side support for HDMI.