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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).

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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]

28 comments fedilink hide all child comments

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)

In first you need understand what type of suspend you use:

Suspend to RAM (aka suspend, aka sleep) The S3 sleeping state as defined by ACPI. Works by cutting off power to most parts of the machine aside from the RAM, which is required to restore the machine's state. Because of the large power savings, it is advisable for laptops to automatically enter this mode when the computer is running on batteries and the lid is closed (or the user is inactive for some time). Suspend to disk (aka hibernate) The S4 sleeping state as defined by ACPI. Saves the machine's state into swap space and completely powers off the machine. When the machine is powered on, the state is restored. Until then, there is zero power consumption. Hybrid suspend (aka hybrid sleep) A hybrid of suspending and hibernating, sometimes called suspend to both. Saves the machine's state into swap space, but does not power off the machine. Instead, it invokes the default suspend. Therefore, if the battery is not depleted, the system can resume instantly. If the battery is depleted, the system can be resumed from disk, which is much slower than resuming from RAM, but the machine's state has not been lost.

I think you use Hybrid suspend. Hybrid suspend store memory to disk (20 seconds lag) and then lost battery for memory renew. Need you Suspend to RAM maybe? 20 Seconds lag will fixed with that.

Then check

cat /sys/power/mem_sleep

If you see

[s2idle] shallow deep

check first if your UEFI advertises some settings for it, generally under Power or Sleep state or similar wording, with options named Windows 10, Windows and Linux or S3/Modern standby support for S0ix, and Legacy, Linux, Linux S3 or S3 enabled for S3 sleep.

If you don't see anything you can swap sleep mode to Suspend to disk. That slow but don't use any power. Or try fix sleep status.

More information you can find here: https://wiki.archlinux.org/title/Power_management/Suspend_and_hibernate

[–] [email protected] 3 points 11 months ago

Thank you for your reply. It says: [s2idle] deep I don't think i have the swap partition, I will try to create that. Thanks!