Regression coreboot 4.12-Purism-4 on Librem-Mini v1 screen does not wake up from standby
on : Librem-Mini v1 OS : PureOS byzantium
4k screen connected via displayport
coreboot 4.12-Purism-4 / seabios
When idle the screen goes in sleep mode ( but the Mini stay active ).
The screen never wake up, with mouse movements or keyboard key press.
I have to hard-shutdown the system by press-hold power.