[x86-64] Resuming from S3 (Sleep/Suspend)

lbschenkel · June 19, 2023 at 1:30 PM

I have upgraded my LibreELEC system to an AMD one (CPU/motherboard/video card). After the upgrade LibreELEC was consistently freezing on resuming from sleep state S3. However, this did not happen when I booted other Linux distros in the same system. After spending a lot of time troubleshooting this issue (including playing with firmware settings and kernel parameters) I finally found out the culprit:

LibreELEC kernel is built with this patch that disables async suspend/resume by default. This can be verified at runtime via /sys/power/pm_async.

Code

# cat /sys/power/pm_async
0

It is possible to re-enable it:

Code

# echo 1 > /sys/power/pm_async
# cat /sys/power/pm_async
1

After this change, my system consistently resumes from suspend. I have not experienced a single freeze with it enabled.

To make this change persistent, I created this file:

Code: .config/tmpfiles.d/pm_async.conf

w /sys/power/pm_async - - - - 1

Posting here hoping that this recipe will prove useful to others here.

Batchman · July 18, 2023 at 9:29 AM

Had to create account just to thank you. This freeze was killing my v11 update. Not sure why this was changed going from 10 to 11.

Thank you

Rauha · November 3, 2024 at 11:08 AM

Quote from lbschenkel

Code

# echo 1 > /sys/power/pm_async
# cat /sys/power/pm_async
1

SSHing this fixes temporarily freezing problems on my Asrock N100DC-ITX, but I am such a beginner that I do not how to make this permanent fix file.

Quote from lbschenkel
Code: .config/tmpfiles.d/pm_async.conf
Code: .config/tmpfiles.d/pm_async.conf
w /sys/power/pm_async - - - - 1

Could anyone help me?

**chewitt** · November 3, 2024 at 1:59 PM

Code

echo "echo 1 > /sys/power/pm_async" > /storage/.config/autostart.sh

Run that command ^ and reboot and it should be applied to the OS on each boot. There's probably a modprobe method which will be lessy hacky, but if it works..