This bug was fixed in the package mutter - 3.36.3-1ubuntu2

---------------
mutter (3.36.3-1ubuntu2) groovy; urgency=medium

  * debian/control:
    - Revert BD on adwaita-icon-theme 3.36.1-2ubuntu3. It was just temporary 
fix.
  * d/p/x11-Add-support-for-fractional-scaling-using-Randr.patch:
    - Use pre-computed CRTC layout size for computing screen size (LP: #1874567,
      LP: #1873403)
    - Decouple the output mode from layout mode capabilities (LP: #1876894,
      LP: #1886996)
    - Ensure we notify CRTC changes on integer scaling changes (LP: #1876894)
    - Apply proper layout monitor config when using fractional scaling
      (LP: #1884754)
    - Restore the fractional settings when reverting to fractional layout
      (LP: #1886996)
  * debian/libmutter-6-0.symbols: Add new private symbol

 -- Marco Trevisan (Treviño) <[email protected]>  Sat, 11 Jul 2020
00:44:33 +0200

** Changed in: mutter (Ubuntu)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1873403

Title:
  [nvidia] Screen turns off when trying to set some fractional scaling
  values

Status in mutter package in Ubuntu:
  Fix Released
Status in nvidia-graphics-drivers package in Ubuntu:
  Confirmed

Bug description:
  When the nvidia driver is installed, the screen turns off when trying
  to set some fractional scaling values like 150%. And it stays off even
  after rebooting and logging in again.

  And from ssh I can see there's no current mode set anymore (just like
  in bug 1869750):

  $ xrandr
  Screen 0: minimum 8 x 8, current 960 x 600, maximum 16384 x 16384
  DVI-I-0 disconnected (normal left inverted right x axis y axis)
  DVI-I-1 disconnected (normal left inverted right x axis y axis)
  DP-0 disconnected (normal left inverted right x axis y axis)
  DP-1 connected primary (normal left inverted right x axis y axis)
     1920x1200     59.95 +  59.88

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: mutter 3.36.1-3ubuntu2
  ProcVersionSignature: Ubuntu 5.4.0-24.28-generic 5.4.30
  Uname: Linux 5.4.0-24-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Fri Apr 17 15:51:15 2020
  InstallationDate: Installed on 2020-02-03 (73 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200124)
  SourcePackage: mutter
  UpgradeStatus: No upgrade log present (probably fresh install)

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