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How much swap?
(lemmy.ca)
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this post was submitted on 07 Jul 2023
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I believe the swap partition is also used when hibernating. So when you use hibernate you need at least equal swap space as memory size.
Hibernate and suspend are different. I configure my laptop to suspend for 3 hours before hibernating. That means I can close the lid for lunch or a commute and instantly resume, but if I leave my laptop in my bag over a long weekend, the battery isn't drained. Does it save much battery? Dunno. A few % over a few days maybe.
Don't use Ubuntu, but are you sure it removed it and didn't do the same thing windows does (i. e. hybrid suspend, where it does the same as hibernating, but then enters suspend, so if power is cut you still have your ram preserved)?
The point isn't to save power, the point is that the laptop is completely off. You can even take out the battery if needed