Comment 3 for bug 2020782

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Daniel van Vugt (vanvugt) wrote : Re: Changing display scale setting and reverting it, causes gnome-shell to error with "Failed to restore previous configuration" and other error messages

Marco is the author of the Xrandr fractional scaling support patch so he might have some immediate ideas. I figure a lot of this is going to be affected by that patch even if you're only trying to use integer scaling.