Blank screen after suspend to ram - resume

[linux_os2]

When logged on suspend -resume to ram and hibernate work OK.
When suspend to ram, from logon screen, resume Blank screen.
Keyboard and mouse inoperative.
ssh not possible.
Disk acces light flickers from time to time.
A force power-cycle is needed.

Videocard 1080TI

x11-drivers/nvidia-drivers-535.216.01-r1
x11-base/xorg-server-21.1.14
sys-kernel/gentoo-sources-6.11.6