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this post was submitted on 14 Aug 2024
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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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Yes, there is FreeSync HDMI, which is supposed to be supported on Linux, and which is unrelated to HDMI 2.1 VRR. Don't see anything about the monitor supporting that though (LG 24GS60F based on your previous post). Nor anything about HDMI 2.1 VRR, it probably only supports VRR via DisplayPort Adaptive Sync.
I verified from the user manual that the freesync is supported over HDMI 2.0(Its a budget 1080p monitor so no HDMI 2.1). The issue seems to be that the HDMI forum has not allowed code necessary for FreeSync HDMI in the open source drivers. Fuck proprietary solutions. I hope that DP (through usb-c or mini DP) becomes the standard even in budget laptops which currently come only with HDMI.
Apparently so it does, and it says "HDMI Freesync" rather than "HDMI [2.1] VRR". FreeSync HDMI is a completely different protocol and is supposed to work under Linux. Found a thread here, can you try
cat /sys/kernel/debug/dri/0/HDMI-A-1/vrr_rangeandedid-decode < /sys/class/drm/card0-HDMI-A-1/edid? Though there is no solution there.