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dmidecode –type 17 | more

man update-rc.d

Удалить xdm из загрузки:

update-rc.d xdm disable

Включить xdm обратно:

update-rc.d xdm enable defaults

На примере unifi

systemctl enable unifi
systemctl is-enabled unifi
systemctl disable unifi

service unifi status
service unifi start
service unifi stop

https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Performance_Tuning_Guide/index.html