i can observe no fractional scaling on a default installation dell xps5790 even 
with a single monitor (4k). similar connecting a second monitor is not working 
separately either.
I tried different display resolution to no avail.

I eventually started changing the display resolution and gave up on
fractional scaling.

nvidia 450
libmutter-6-0:
  Installed: 3.36.6-1ubuntu0.20.04.2
--------
xrandr program version       1.5.0
Server reports RandR version 1.6


------------
lspci 
00:02.0 VGA compatible controller: Intel Corporation UHD Graphics 630 (Mobile) 
(rev 02) (prog-if 00 [VGA controller])
    DeviceName:  Onboard IGD
    Subsystem: Dell UHD Graphics 630 (Mobile)
    Flags: bus master, fast devsel, latency 0, IRQ 176
    Memory at eb000000 (64-bit, non-prefetchable) [size=16M]
    Memory at 80000000 (64-bit, prefetchable) [size=256M]
    I/O ports at 4000 [size=64]
    Expansion ROM at 000c0000 [virtual] [disabled] [size=128K]
    Capabilities: <access denied>
    Kernel driver in use: i915
    Kernel modules: i915

I found the prime-select toggle and set it to intel...
same issue

** Attachment added: "monitors.xml"
   
https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1870736/+attachment/5431931/+files/monitors.xml

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-control-center in Ubuntu.
https://bugs.launchpad.net/bugs/1870736

Title:
  [nvidia] Screen scaling 125% gives 200%

Status in gnome-control-center package in Ubuntu:
  Confirmed
Status in mutter package in Ubuntu:
  Confirmed

Bug description:
  Procedure used:
  1.
  Fully updated system via apt update && apt upgrade

  2.
  Select the screen setup in gnome control center

  3. 
  Click the "Fractional scaling" toggle

  4. 
  Select 125% and click the green "use" button top right (it says "Anvend" in 
dansih)

  5.
  Observe that the window has grown a lot, click the "use new settings" button

  6.
  The window tells me, I am at 200% scaling. The "200%" option is now 
highlighted.

  7.
  Switch back to 100% and file this bug.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubuntu-release-upgrader-core 1:20.04.16
  ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
  Uname: Linux 5.4.0-21-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu22
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Apr  4 09:42:34 2020
  InstallationDate: Installed on 2018-01-14 (810 days ago)
  InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 
(20170801)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=da_DK.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  Symptom: release-upgrade
  UpgradeStatus: Upgraded to focal on 2020-04-03 (0 days ago)

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