I think I've found a bug in the openSUSE installer that adds the NOAPIC option under a certain condition. I use openSUSE a lot, as a desktop, as a server, with and without microOS variants. I checked my other machines and the NOAPIC option is not present in the grub. But the two servers mentioned in this message had a less "standard" installation, as Hetzner doesn't support openSUSE by default. I therefore start from an ubuntu installation, on which I download vmlinuz.install and initrd.install and then connect to the server via ssh -X root@XXX to start the installation. Obviously, with this type of "remote" installation, the NOAPIC option is added automatically. Here I'm looking at a third server which has been installed in the same way, which is not yet in production, which is based on Leap Micro and the option is also present ... kiba:~ # cat /proc/cmdline BOOT_IMAGE=/boot/vmlinuz-5.14.21-150500.55.68-default root=UUID=c887e740-95e0-4968-8bb6-f5467ea422d6 rd.timeout=60 noapic swapaccount=1 quiet rd.shell=0 security=selinux selinux=1 enforcing=1 mitigations=auto kiba:~ # cat /etc/os-release NAME="openSUSE Leap Micro" VERSION="5.5" ID="opensuse-leap-micro" ID_LIKE="suse opensuse opensuse-leap suse-microos" VERSION_ID="5.5" PRETTY_NAME="openSUSE Leap Micro 5.5" ANSI_COLOR="0;32" CPE_NAME="cpe:/o:opensuse:leap-micro:5.5" BUG_REPORT_URL="https://bugs.opensuse.org" HOME_URL="https://www.opensuse.org/" DOCUMENTATION_URL="https://en.opensuse.org/Portal:LeapMicro" LOGO="distributor-logo-LeapMicro"