Are you using Nvidia? If so then this would be bug 1809407.
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apport-collect 1829818
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ubuntu-bug gnome-shell
** Tags added: disco
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1829818
Title:
desktop wallpaper darker after resume
Status in gnome-shell package in Ubuntu:
Incomplete
Bug description:
after a sleep & resume cycle, the desktop wallpaper has a darker
color, as if a black layer was applied to it with some transparency.
if I restart and log in, the wallpaper is the original color
my expectation is that the desktop wallpaper image should have the
same, unchanged colors
$ lsb_release -rd
Description: Ubuntu 19.04
Release: 19.04
$ apt-cache policy gnome-shell
gnome-shell:
Installed: 3.32.1-1ubuntu1~19.04.1
Candidate: 3.32.1-1ubuntu1~19.04.1
Version table:
*** 3.32.1-1ubuntu1~19.04.1 500
500 http://archive.ubuntu.com/ubuntu disco-proposed/main amd64
Packages
100 /var/lib/dpkg/status
3.32.0+git20190410-1ubuntu1 500
500 http://ch.archive.ubuntu.com/ubuntu disco/main amd64 Packages
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