Is 4K VRR over HDMI possible on Linux?
Is 4K VRR over HDMI possible on Linux?
Everything that I've been reading says that it's only doable with DisplayPort.
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If you're referring to VRR from the HDMI 2.1a FRL spec (used by eg. OLED TVs), then that is currently only supported for Nvidia cards on Linux. It works with the default configuration after installing the proprietary drivers. I'm currently using this with an LG OLED TV at 4K@120Hz VRR.
For AMD cards, it is currently not supported, though it might be coming soon: https://gitlab.freedesktop.org/drm/amd/-/issues/1417#note_1988469
EDIT: Also, for Nvidia, VRR is technically used/enabled on the wire for both X11 and Wayland, but the refresh rate is locked to the max on Wayland. You'll need to use X11 for the refresh rate to actually be variable.
Awesome, thanks for the info!! I'm looking forward to building a new box in the near future, so hopefully the AMD side of things will have been sorted out by then. Much appreciated!
Side note: Jerboa is showing 3 comments, yet yours is the only one I'm seeing. Weird.