Public bug reported:

Setting fractional scaling between 125% and 175% yields improper
behavior. When set to 125%, display will be scaled to 200%. Attempting
to use either 150% or 175% scaling causes gnome-control-center to
segfault. Selecting 200% scaling exhibits proper behavior.

Steps to reproduce the issue:

1. Enable the Fractional Scaling toggle under Displays in gnome-control-center.
2a. Select 125% beside Scale, and press "Apply" at the top right. Display 
should scale to 200% and the selected scale should also change to 200%.
2b. Select either 150% or 175% beside Scale and press "Apply" at the top right. 
Monitor may possibly turn off for a few seconds, and gnome-control-center will 
have segfaulted with scaling remaining at 100% when it turns back on.

Release: Ubuntu 20.04 LTS
Package version: 1:3.36.1-1ubuntu5
Expected behavior: Display scaling set properly to fractional values
Exhibited behavior: Improper scaling with scale set to 125% and segmentation 
faults with 150% and 175% scale

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-control-center 1:3.36.1-1ubuntu5
ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
Uname: Linux 5.4.0-26-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu Apr 23 21:17:22 2020
InstallationDate: Installed on 2020-04-23 (0 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-control-center
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gnome-control-center (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

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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/1874583

Title:
  Setting fractional scaling beyond 125% causes segfault

Status in gnome-control-center package in Ubuntu:
  New

Bug description:
  Setting fractional scaling between 125% and 175% yields improper
  behavior. When set to 125%, display will be scaled to 200%. Attempting
  to use either 150% or 175% scaling causes gnome-control-center to
  segfault. Selecting 200% scaling exhibits proper behavior.

  Steps to reproduce the issue:

  1. Enable the Fractional Scaling toggle under Displays in 
gnome-control-center.
  2a. Select 125% beside Scale, and press "Apply" at the top right. Display 
should scale to 200% and the selected scale should also change to 200%.
  2b. Select either 150% or 175% beside Scale and press "Apply" at the top 
right. Monitor may possibly turn off for a few seconds, and 
gnome-control-center will have segfaulted with scaling remaining at 100% when 
it turns back on.

  Release: Ubuntu 20.04 LTS
  Package version: 1:3.36.1-1ubuntu5
  Expected behavior: Display scaling set properly to fractional values
  Exhibited behavior: Improper scaling with scale set to 125% and segmentation 
faults with 150% and 175% scale

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: gnome-control-center 1:3.36.1-1ubuntu5
  ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
  Uname: Linux 5.4.0-26-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Apr 23 21:17:22 2020
  InstallationDate: Installed on 2020-04-23 (0 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: gnome-control-center
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1874583/+subscriptions

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