Bug#979715: inux-image-4.19.0-11-amd64: Screen is unusable because of flashing after blanking

[Jürgen Bausa]

It seems that the problem was caused by the seabios I used for  CSM boot. 
After installing a clean coreboot (no seabios payload) and running uefi boot 
the problem dissappeared.

Regards,

Jürgen