"Variable refresh rate: not supported" but monitor is MediaSync certified

[cyber-sushi]

Hello!
My monitor, an Asus PA329CRV, supports VRR through the MediaSync certification (and MediaSync is enabled in the monitor's settings), howerver niri msg outputs returns "Variable refresh rate: not supported".

This is how my 3 monitors are configured:

output "HDMI-A-1" {
    mode "2560x1440@59.951"
    scale 1
    position x=0 y=1446
    variable-refresh-rate
}

output "DP-1" {
    mode "1920x1080@143.981"
    scale 1
    position x=640 y=364
    variable-refresh-rate
    focus-at-startup
    hot-corners {
        off
    }
}

output "DP-4" {
    mode "3840x2160@60.000"
    scale 1.25
    position x=2560 y=0
    variable-refresh-rate
}

VRR works properly on my other monitors (HDMI-A-1 and DP-1), but not on DP-4.
By the way, thank you for the amazing work on Niri!

System Information

niri version: niri 26.04 (8ed0da4)

Distro: Arch Linux

GPU: AMD Radeon RX 6750XT

CPU: AMD Ryzen 7 9700X

[Sempyos]

Uh, niri takes the information directly from the monitor, if it doesn't advertise it's supported then we can't do much

[cyber-sushi]

Oh, understandable

I did some tests, and apparently it's marked as supported if I connect it through HDMI, but not through DP or DP-Alt

Oddly enough, if I connect both HDMI and DP at the same time, and tell the monitor to get the input from the HDMI cable, then Niri returns that VRR is supported on both outputs, but this might just be a weird quirk with my monitor

Thank you anyway!

[Sempyos]

That's a bit silly,