Power Management: Difference between revisions

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=== Hibernation ===

Hibernation requires a configured swap device. See [https://nixos.org/manual/nixos/stable/#ch-installation installation instructions] on how to create a swap partition. An example configuration could look like this:<syntaxhighlight lang="nix">

Hibernation requires a configured swap device. See [https://nixos.org/manual/nixos/stable/#ch-installation installation instructions] on how to create a swap partition.

Please note that <code>resumeDevice</code> must match the output of <code>swapon -s</code> especially if you're dealing with mapped volumes (LUKS, logical volumes, logical volumes under LUKS, etc.). If you're using a swapfile, you must also [https://search.nixos.org/options?channel=unstable&show=boot.resumeDevice&from=0&size=50&sort=relevance&type=packages&query=resume+offset specify the offset to it].

Therefore, an example configuration could look like this:<syntaxhighlight lang="nix">

/*

I'm hibernating into a logical volume that's also under LUKS. Pretty cool, right?

*/

swapDevices = [

{

device = "/dev/~~hda7~~";

device = "/dev/VG/SWAP";

}

];

boot.resumeDevice = "/dev/~~hda7~~";

</syntaxhighlight>~~Please note that encrypted swap devices or swap files are not yet supported for hibernation.~~

boot.resumeDevice = "/dev/dm-7";

</syntaxhighlight>Derived from a system with the following output from <code>swapon -s</code> :<syntaxhighlight>

Filename Type Size Used Priority

/dev/dm-7 partition 67108860 00

/dev/zram0 partition 32881148 032767

</syntaxhighlight>

Test and use hibernation with following command:<syntaxhighlight lang="nix">

@@ Line 43: / Line 43: @@
 === Hibernation ===
-Hibernation requires a configured swap device. See [https://nixos.org/manual/nixos/stable/#ch-installation installation instructions] on how to create a swap partition. An example configuration could look like this:<syntaxhighlight lang="nix">
+Hibernation requires a configured swap device. See [https://nixos.org/manual/nixos/stable/#ch-installation installation instructions] on how to create a swap partition.
+Please note that <code>resumeDevice</code> must match the output of  <code>swapon -s</code> especially if you're dealing with mapped volumes (LUKS, logical volumes, logical volumes under LUKS, etc.). If you're using a swapfile, you must also [https://search.nixos.org/options?channel=unstable&show=boot.resumeDevice&from=0&size=50&sort=relevance&type=packages&query=resume+offset specify the offset to it].
+Therefore, an example configuration could look like this:<syntaxhighlight lang="nix">
+/*
+  I'm hibernating into a logical volume that's also under LUKS. Pretty cool, right?
+*/
 swapDevices = [
    {
-     device = "/dev/hda7";
+     device = "/dev/VG/SWAP";
    }
 ];
-boot.resumeDevice = "/dev/hda7";
-</syntaxhighlight>Please note that encrypted swap devices or swap files are not yet supported for hibernation.
+boot.resumeDevice = "/dev/dm-7";
+</syntaxhighlight>Derived from a system with the following output from <code>swapon -s</code> :<syntaxhighlight>
+Filename                                Type            Size           Used             Priority
+/dev/dm-7                               partition       67108860       00
+/dev/zram0                              partition       32881148       032767
+</syntaxhighlight>
 Test and use hibernation with following command:<syntaxhighlight lang="nix">