User-Agent:       Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:70.0) Gecko/20100101 Firefox/70.0
Build Identifier: 

Clean install of 15.1 with KDE worked fine. After installing updates and rebooting started getting strange behavior. Screen would begin blinking during plymouth screens. Login screen would eventually come up as normal, but after login I would get a blank desktop. After about 5 minutes, other components such as desktop icons, menus, etc would eventually load. But occasionally still get screen blinking, like when opening firefox. Thought maybe it was a KDE problem, so I did another clean install with XFCE instead. Get the same exact behavior. So to rule out the kernel first, I installed the current 4.19 kernel from OBS and the problem ceased. I don't know what information would be relevant to troubleshoot, but I'd be happy rollback the kernel to stock, reinstall, provide, logs or whatever else might help.

Reproducible: Always

Steps to Reproduce:
1.Update kernel
2.restart
3.
Actual Results:  
Display turns off and on repeatedly during plymouth. Once logged in, desktop takes an excessive time to load.