The problems you are experiencing @mobilebackup and @agwin, are most
likely due to the way the workaround works.  Correct me if I am wrong,
but the workaround is asking the graphics system to render a larger
canvas (say 2x, 8K or whatever) and scales this down to the viewport
size.  If an application is not enabled for HiDPI mode, they will be
very squished.  If you don't have sqaure pixels (like most of us), you
will get bad text, and if you don't check for orientation, the viewport
will break.

The reason I said this is a fab workaround, but won't hold for
production, apart from above, is we are asking the card to render a huge
area.  If you move windows around or watch video with GPU decoding, the
card is going to have to move a huge amount of data around.

These are my ramblings, for whatever they are worth.

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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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