Commit d2c949d7 authored Jan 18, 2026 by Arian van Putten

nixos/dbus: switch default implementation to dbus-broker

dbus-broker provides higher performance and reliability compared to the
classic dbus-daemon. The prerequisite PR #477800 has been merged, making
this switch safe.

Note that services.dbus.implementation is a switch inhibitor: changing
the D-Bus implementation between generations requires a reboot rather
than nixos-rebuild switch, since restarting D-Bus mid-session is unsafe.

Fixes #299476

parent 0c0c466c

nixos/doc/manual/release-notes/rl-2605.section.md

+9 −0

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		@@ -42,6 +42,15 @@

		- The default kernel package has been updated from 6.12 to 6.18. All supported kernels remain available.

		- The default D-Bus implementation has been switched from `dbus` to `dbus-broker`. dbus-broker provides
		higher performance and reliability while maintaining compatibility with the D-Bus reference implementation.

		Note that changing `services.dbus.implementation` is a switch inhibitor: switching between
		implementations requires a reboot rather than just `nixos-rebuild switch`, because restarting D-Bus
		mid-session is unsafe.

		Users who wish to keep the classic daemon can set: `services.dbus.implementation = "dbus";`

		## New Modules {#sec-release-26.05-new-modules}

		<!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->

nixos/modules/services/system/dbus.nix

+1 −1

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		@@ -68,7 +68,7 @@ in
		"dbus"
		"broker"
		];
		default = "dbus";
		default = "broker";
		description = ''
		The implementation to use for the message bus defined by the D-Bus specification.
		Can be either the classic dbus daemon or dbus-broker, which aims to provide high