Are you using Nvidia? If so then this would be bug 1809407.
Please run this command to send us more information about the machine:
apport-collect 1829818
and in future you can save time by reporting bugs with all the required
information automatically attached via this command:
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
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