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You can then bind this to a hotkey or similar~~. <code>sudo</code> may be avoidable if your user is in the correct group, or udev rules have set the appropriate <code>/sys</code> permissions~~.

You can then bind this to a hotkey or similar.

~~Add~~ <code>i2c~~-dev~~</code> to <code>~~boot~~.~~kernelModules~~</code> ~~and {{nixos~~:~~package|~~ddcutil~~}} to your system packages to make permanent~~.

To make this permanent, add {{nixos:package|ddcutil}} to your system packages, and enable i2c support.<syntaxhighlight lang="nix">

hardware.i2c.enable = true

</syntaxhighlight>To interact with DDC/CI without root, also add your user to the <code>i2c</code> group (or the group defined by <code>[https://search.nixos.org/options?show=hardware.i2c.group&query=hardware.i2c.group hardware.i2c.group]</code>), or [https://www.ddcutil.com/i2c_permissions/ set udev rules manually].

=== Via <code>ddcci-driver</code> ===

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Device autodetection is tricky with i2c so we need to trigger it manually with the <code>0x37</code> code. The <code>sleep</code> is often unfortunately necessary.

The driver has had some issues with kernels > 6.8, the below overlay should allow it to build if you encounter issues.

The driver has had some issues with kernels > 6.8, the below overlay should allow it to build if you encounter issues ([https://gitlab.com/ddcci-driver-linux/ddcci-driver-linux/-/merge_requests/17 source]).

@@ Line 75: / Line 75: @@
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-You can then bind this to a hotkey or similar. <code>sudo</code> may be avoidable if your user is in the correct group, or udev rules have set the appropriate <code>/sys</code> permissions.
+You can then bind this to a hotkey or similar.
-Add <code>i2c-dev</code> to <code>boot.kernelModules</code> and {{nixos:package|ddcutil}} to your system packages to make permanent.
+To make this permanent, add {{nixos:package|ddcutil}} to your system packages, and enable i2c support.<syntaxhighlight lang="nix">
+hardware.i2c.enable = true
+</syntaxhighlight>To interact with DDC/CI without root, also add your user to the <code>i2c</code> group (or the group defined by <code>[https://search.nixos.org/options?show=hardware.i2c.group&query=hardware.i2c.group hardware.i2c.group]</code>), or [https://www.ddcutil.com/i2c_permissions/ set udev rules manually].
 === Via <code>ddcci-driver</code> ===
@@ Line 116: / Line 118: @@
 Device autodetection is tricky with i2c so we need to trigger it manually with the <code>0x37</code> code. The <code>sleep</code> is often unfortunately necessary.
-The driver has had some issues with kernels > 6.8, the below overlay should allow it to build if you encounter issues.
+The driver has had some issues with kernels > 6.8, the below overlay should allow it to build if you encounter issues ([https://gitlab.com/ddcci-driver-linux/ddcci-driver-linux/-/merge_requests/17 source]).
 <syntaxhighlight lang=nix>