I had UEFI + secure boot enabled. Everything worked Ok.
Then I wanted to change memory frequency. I’m using APU, i.e. memory shared between CPU and GPU.
I went to a BIOS and changed it. To perform memory test I loaded Memtest86 with openSUSE’s installer USB flash. To do so I needed to load openSUSE installer in CSM mode.
After test went Ok, I reverted settings to CSM = disable.
And now OS loads in text mode with secure boot enabled (BIOS parameter: OS UEFI type = Windows).
When I set BIOS parameter “OS UEFI type = Other” system loads in graphical mode successfully, but with secure boot disabled.
:~> dmesg | grep -i secur 0.000000] secureboot: Secure boot disabled ...
To examine boot I changed BIOS setting back to “OS UEFI type = Windows” and modified kernel parameters: deleted “quiet” and “splash=silent”, and added “plymouth.enable=0”.
I got message:
[FAILED] Failed to start X Display Manager. See 'systemctl status display-manager.service' for details.
After login I run this command and got:
:~> systemctl status display-manager.service ? display-manager.service - X Display Manager Loaded: loaded (/usr/lib/systemd/system/display-manager.service; enabled; vendor preset: enabled) Active: failed (Result: exit-code) Process: (some #) ExecStart=/usr/lib/X11/display-manager start (code=exited, status=1/FAILURE)
How to fix this?
I.e. how to restore secure boot in graphical interface?