I am creating this topic to reduce number of support issues.
For all those who experienced screen blinking issues on Librem 14 with PureBoot , especially visible on Plasma/KDE desktop, less visible in Gnome(default) Desktop.
Problem is not an hardware, problem is bios.
Actual way to solve issue is to fallback standard Coreboot…
If you are experiencing similar issue, try flash CoreBoot instead of PureBoot.