thanks to the forum found the video= option: https://raw.githubusercontent.com/torvalds/linux/master/Documentation/fb/modedb.txt video=1024x768M@60m works, plymouth shows, KDE shows (at 1920x1080) video=1920x1080M@60m blackscreen video=1920x1080M@60me blackscreen video=1920x1080M@60mD blackscreen video=eDP:1920x1080M@60m blackscreen video=eDP:1920x1080M@60me blackscreen video=eDP:1920x1080M@60mD blackscreen video=eDP:1024x768M@60m blackscreen video=eDP:1024x768M@60me blackscreen video=eDP:1024x768M@60mD blackscreen