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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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Is FreeSync over HDMI not supported in linux even for FreeSync compatible monitors? (discuss.tchncs.de)

submitted 4 months ago* (last edited 4 months ago) by [email protected] to c/[email protected]

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I recently made a post about my FreeSync certified monitor not supporting VRR over HDMI. I thought that there was VRR support over HDMI even for versions below 2.1 spec. Am I mistaken in my assumption¿? Has the HDMI forum prevented the implementation of FreeSync in the open source drivers¿?

Obligatory fuck the HDMI forum and the HDMI spec.

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[–] [email protected] 10 points 4 months ago (1 children)

Actually it works fine on Steam Deck. It uses VRR over DP to the dock, which then translates it to HDMI with VRR. The dock has proprietary firmware to do this.

Intel and Nvidia hardware with open source kernel drivers also do a similar trick where the HDMI part is in a firmware blob. Only AMD does not work with HDMI VRR.

[–] [email protected] 3 points 4 months ago* (last edited 4 months ago) (1 children)

Source? So it can do 4k, 120hz+ VRR? I have found comments and change logs, but I’m not sure it fixes the HDMI 2.1 issue. Which would be 4k+ @ 120hz+ with VRR.

NM I found what I was looking for.

https://overkill.wtf/steamos-3-5-5-brings-just-so-much-stuff-including-vrr-for-steam-deck-dock/

Looks like it just gets VRR working, generally. Unfortunately not some kind of 2.1 workaround.

[–] [email protected] 1 points 4 months ago* (last edited 4 months ago)

It would allow them to do HDMI FRL also, which is probably what you mean when you say HDMI 2.1. AMD cards also do HDMI FRL I thought. FRL is what allows things like 4k120Hz (higher bandwidth modes). The VRR that the Dock does is the VRR standardized with 2.1, which is why it works on TVs and devices that do not support freesync (see: LG TVs).

Anyway, the Dock doesn't have a fast enough HDMI converter to do that. It's not a licensing issue. Next gen Deck/Dock will probably do it.