Opened this bug again, I noticed that everything works fine after entering "sleep" manually in the console or menu.
BUT if sleep mode is entered from the system settings in "Suspend session", all the graphics are reset and flickers. See attached image. ** Changed in: kwin (Ubuntu) Status: Fix Released => New ** Attachment added: "Screenshot_20200427_181816.png" https://bugs.launchpad.net/ubuntu/+source/kwin/+bug/1870791/+attachment/5361755/+files/Screenshot_20200427_181816.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1870791 Title: Graphics flicker after sleep mode To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/kwin/+bug/1870791/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs