Frederic, 1 year ago

Hibernation or suspend? 2 different things. For hibernation you need a swap space at least the size of your RAM, and then the laptop is powered off after this.

For suspend, in your dmesg, see if you have:

ACPI: PM: (supports S0 S3 S4 S5)

if you have S3 your laptop should lost only a few percent.

do a:

cat /sys/power/mem_sleep

what does it says?

New CPU/BIOS/PC/Laptop only support something called “s0 idle” meaning it is like a cellphone, everything is running, and each drivers/components/os should enter low power themselves, if they do not, well, your battery is draining.

S3 means “suspend to RAM”, only RAM is powered and everything else is off, your laptop can stay like this for days. I don’t know who decided that this is bad and your laptop should be like your cellphone, always running?!?