ok, needed zypper install kernel-default-5.19~rc8-3.1.gd472a44.x86_64 and disable secure boot to run this kernel with cmdline BOOT_IMAGE=/boot/vmlinuz-5.19.0-rc8-3.gd472a44-default root=UUID=ccd2f332-dbd5-45c1-8299-b5d32f56567b mitigations=auto -> same black screen flickering. And ok with nomodeset :(