Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: gnome-control-center (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/2008355
Title:
Unable to set fractional scaling on three monitor setup
Status in gnome-control-center package in Ubuntu:
Confirmed
Bug description:
I have three monitors: one 4K (3840x2160) display and two 2560x1440.
I've tried setting fractional scaling to 150% on the 4K display in gnome
control center (ubuntu 22.10), but it does not work.
It works fine when I disconnect some displays, leaving only the 4K or 4k and
one 2560.
However, when all three are connected the apply button is disabled and the
following message appears:
"Changes Cannot be Applied. This could be due to hardware limitations."
When gnome-control-center is started from terminal it shows the following
warning:
```
(gnome-control-center:12235): display-cc-panel-WARNING **: 18:42:27.389:
Config not applicable: GDBus.Error:org.freedesktop.DBus.Error.InvalidArgs:
Logical monitors not adjacent
```
thought it doesn't seem to be the case.
After some digging I've found a workaround, executing the following commands
seems to do what the control panel does:
```
xrdb -m <<EOF
Xft.dpi: 192
EOF
xrandr --fb 15360x2880 --dpi 192 --output DP-4 --mode 3840x2160 --panning
5120x2880+0+0 --scale-from 5120x2880 \
--output DP-2 --mode 2560x1440 --panning 5120x2880+5120+0 --scale-from
5120x2880 --primary \
--output DP-0 --mode 2560x1440 --panning 5120x2880+10240+0 --scale-from
5120x2880
```
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