BIOS, turn off Early Logo Display to OFF in the Sign of Life options
BIOS, disable Secure Boot
In the system, edit and configure in /etc/default/grub to add to the kernel options : mem_sleep_default=deep
My current kernel options are : GRUB_CMDLINE_LINUX_DEFAULT="quiet splash mitigations=off mem_sleep_default=deep"
(do NOT use mitigations=off unless you seriously know what you're doing)
Reboot. TO check if the deep sleep is on :
cat /sys/power/mem_sleep
Should return :
s2idle [deep]
The deep here confirms the deep sleep mode is turned on.
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