Comment 4 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

Fabio, please try building mutter without the fractional scaling patch. So just delete:

  ubuntu/x11-Add-support-for-fractional-scaling-using-Randr.patch

from debian/patches/series.

That should retain support for integer scaling, but will tell us if the fractional scaling patch is causing this bug as a side effect.