I've got the feature turned on. But Gnome 49 only supports fractional scaling ratios that divide your display into a whole, integer number of pixels. And they only calculate candidate ratios by dividing your resolution up to a denominator of 4.
So on my Framework 13, I no longer have the 150% option. I can pick 133%, double, or triple. 160% would be great, but that requires a denominator of 5, which Gnome doesn't evaluate. And you can't define your own values in monitors.xml anymore.
Oh that’s interesting. I didn’t know that! I personally don’t use fractional scaling any more.
My Framework 13 with a 2880x1920 screen running Gnome 49 on Arch allows for selecting 125, 133, 150, 166, 200, 250, 266, 300, 333, and 375.
org/gnome/mutter/experimental-features; scale-monitor-framebuffer, xwayland-native-scaling