I have exactly same problem, I've tried both 440, and 435 Nvidia drivers. the results of:
$ xrandr --verbose --output HDMI-0 --scale 2x2 screen 0: 6880x2880 1820x762 mm 96.00dpi crtc 0: 3440x1440 59.97 +0+0 "HDMI-0" xrandr: Configure crtc 0 failed crtc 0: disable crtc 1: disable crtc 2: disable crtc 3: disable crtc 4: disable crtc 5: disable crtc 6: disable screen 0: revert crtc 0: revert crtc 1: revert X Error of failed request: BadValue (integer parameter out of range for operation) Major opcode of failed request: 140 (RANDR) Minor opcode of failed request: 21 (RRSetCrtcConfig) Value in failed request: 0x0 Serial number of failed request: 72 Current serial number in output stream: 72 $ xrandr --verbose --output HDMI-0 --scale 1.25x1.25 screen 0: 4300x1800 1137x476 mm 96.00dpi crtc 0: 3440x1440 59.97 +0+0 "HDMI-0" xrandr: Configure crtc 0 failed crtc 0: disable crtc 1: disable crtc 2: disable crtc 3: disable crtc 4: disable crtc 5: disable crtc 6: disable screen 0: revert crtc 0: revert crtc 1: revert X Error of failed request: BadValue (integer parameter out of range for operation) Major opcode of failed request: 140 (RANDR) Minor opcode of failed request: 21 (RRSetCrtcConfig) Value in failed request: 0x0 Serial number of failed request: 72 Current serial number in output stream: 72 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1870736 Title: [nvidia] Screen scaling 125% gives 200% To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1870736/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
