Power Management
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Suspend
Suspend hooks
NixOS provides the powerManagement.resumeCommands option which defines commands that are added to a global script that will be executed after resuming.
powerManagement.resumeCommands = ''
echo "This should show up in the journal after resuming."
'';
It is also possible to use the post-resume target directly to make a service.
systemd.services.your-service-name = {
description = "Service description here";
wantedBy = [ "post-resume.target" ];
after = [ "post-resume.target" ];
script = ''
echo "This should show up in the journal after resuming."
'';
serviceConfig.Type = "oneshot";
};
Hibernation
Hibernation requires a configured swap device. See installation instructions on how to create a swap partition. An example configuration could look like this:
swapDevices = [
{
device = "/dev/hda7";
}
];
boot.resumeDevice = "/dev/hda7";
Please note that encrypted swap devices or swap files are not yet supported for hibernation. Test and use hibernation with following command:
systemctl hibernate
Tips and tricks
Go into hibernate after specific suspend time
Using following configuration, your system will go from suspend into hibernate after 1 hour:
systemd.sleep.extraConfig = ''
HibernateDelaySec=1h
'';
Troubleshooting
System immediately wakes up from suspend
Particularly in some Gigabyte motherboards with NVMe drives, the system may immediately wake up from being suspended. This can be worked around by disabling the wakeup triggers for the offending components:
Solution 1: Disabling wakeup triggers for all PCIe devices
If you don't need your system to wakeup via PCIe components you can simply disable it for all without needing to determine which component is causing problems.
services.udev.extraRules = ''
ACTION=="add", SUBSYSTEM=="pci", DRIVER=="pcieport", ATTR{power/wakeup}="disabled"
'';
Solution 2: Disable a common NVMe interface
Specifically on Gigabyte motherboards you can try targetting only the NVMe ports.
services.udev.extraRules = ''
ACTION=="add" SUBSYSTEM=="pci" ATTR{vendor}=="0x1022" ATTR{device}=="0x1483" ATTR{power/wakeup}="disabled"
'';
Solution 3: Disable a single device's wakeup triggers
If you wish to be more granular in what components should no longer be able to wakeup your system, you can find out which component is causing the wakeup events.
First, list all components and their current wakeup status:
$ cat /proc/acpi/wakeup
Device S-state Status Sysfs node
GP12 S4 *enabled pci:0000:00:07.1
GP13 S4 *disabled pci:0000:00:08.1
XHC0 S4 *enabled pci:0000:0a:00.3
GP30 S4 *disabled
....
PT27 S4 *disabled
PT28 S4 *disabled
PT29 S4 *disabled pci:0000:03:09.0
You can temporarily toggle a device by writing its "Device" name back into /proc/acpi/wakeup
echo GPP0 | sudo tee /proc/acpi/wakeup
After finding out which component is causing unwanted wakeups you can use the sysfs id to find out the "vendor" and "device" fields:
$ cat /sys/class/pci_bus/0000:04/device/0000:04:00.0/vendor
0x1987
$ cat /sys/class/pci_bus/0000:04/device/0000:04:00.0/device
0x5013
And finally use those values in a udev rule:
services.udev.extraRules = ''
ACTION=="add" SUBSYSTEM=="pci" ATTR{vendor}=="0x1987" ATTR{device}=="0x5013" ATTR{power/wakeup}="disabled"
'';