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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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I need some help with linux energy management and hibernation (lemmy.ml)

submitted 11 months ago by [email protected] to c/[email protected]

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Hi there!

I need some help with my framework laptop and fedora. I want to switch to linux more permanently, but fedora does not enter hibernation properly when closing the lid. I dont care 10-20sec of wakeup time when opening it again. (even windows is more efficient?!) The relatively bad performance on battery life is OK for me, I already installed TLP instead of the default power management. But when closing the lid, the battery drains about 80% over night (10h?) which seems to be more than what other people reported.

I could not find a guide on this, which i understood (still a massive noob to afraid to mess up my carefully crafted linux partition :D).

If you have any advice I appreciate it! Thanks a lot! :)

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[–] [email protected] 17 points 11 months ago (1 children)

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?!?

[–] [email protected] 1 points 11 months ago

Modern Fedora doesn't enable swap by default and configures zram instead. Of course, you can't hibernate to zram, so getting basic hibernation to work involves either disabling zram and configuring swap, or using callbacks to temporarily disable zram and enable swap right before suspending.

Neither is very beginner friendly, unfortunately.