A setting of 2, 3, etc, which is all you can do with scaling-factor, may not be ideal for certain HiDPI displays and smaller screens (e.g. small tablets).
You can achieve any non-integer scale factor by using a combination of GNOME’s scaling-factor and xrandr.
First scale GNOME up to the minimum size which is too big. Usually “2” is already too big, otherwise try “3” etc. Then start scaling down by setting zoom-out factor with xrandr. First get the relevant output name, the examples below use eDP1. Start e.g. with zoom-out 1.25 times. If the UI is still too big, increase the scale factor; if it is too small decrease the scale factor.
$ xrandr --output eDP1 --scale 1.25x1.25
[updates once a week] = [90% less problems]
how to add system logs:
wget http://bit.ly/2GCG9k2 && sh 2GCG9k2
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