It looks like it's working now in Ubuntu 17.10! In the display settings you can set the resolution and the scaling individually per monitor if you are using Wayland. You might have to turn on fractional scaling (see http://www.omgubuntu.co.uk/2017/09/enable-fractional-scaling-gnome- linux).
If I set my laptop monitor to 3840 x 2160 and 175% scaling and the external monitor to 1920x1080 and 100% scaling, xrandr says: Screen 0: minimum 320 x 200, current 2192 x 2313, maximum 8192 x 8192 XWAYLAND0 connected 2192x1233+0+1080 (normal left inverted right x axis y axis) 350mm x 190mm 2192x1233 59.89*+ XWAYLAND4 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 530mm x 300mm 1920x1080 59.96*+ I am seeing a flickering white line just above the gnome top bar (and it flickers on the right hand side), though. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-control-center in Ubuntu. https://bugs.launchpad.net/bugs/1528319 Title: Scaling factors for HiDPI on multiple monitors To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-control-center/+bug/1528319/+subscriptions -- desktop-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
