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…
@joao.azevedo FYI
If you are experiencing similar issue, try flash CoreBoot instead of PureBoot.