I am testing on the Magic SysRq REISUB key sequence to recover from problematic situations.
It is really paradox:
I am using Version 15 KDE and everything is working fine. On the desktop, I can go to Leave > restart and it works fine.
But, when using the Magic SysRq REISUB, the system reacts and seems to restart, but after 3 seconds, my screen does not get any signals and gets into "no signal" mode. After that, nothing happens. Trying REISUB again does not work. I have to switch off and on the hardware.
I am using a macmini on Intel, it makes that sound when restarting, it does so when doing REISUB.
I have a wireless keyboard that works out of the box, but cannot activate screen or do second REISUB after first REISUB.
I tried reconnecting the video cable but nothing helps.
When I do the normal desktop reboot, it works. I get a black screen, then white, then black again, but HERE is when REISUB behaves differently: I get the no signal screen, otherwise, with normal reboot, I see a cursor on the top left, then the KDE logo and the desktop loads.
I have looked and search for this problem but did not find anything like this. This is strange.
Anyone who can suggest what this could be?