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Diffstat (limited to 'README.md')
| -rw-r--r-- | README.md | 6 |
1 files changed, 5 insertions, 1 deletions
@@ -18,14 +18,18 @@ One can build and install the program using `make install`. Consult the Makefile ## Permissions -Modifying brightness requires write permissions for device files. `brightnessctl` accomplishes this (without using `sudo`/`su`/etc.) by either of the following means: +Modifying brightness requires write permissions for device files or systemd support. `brightnessctl` accomplishes this (without using `sudo`/`su`/etc.) by either of the following means: 1) installing relevant udev rules to add permissions to backlight class devices for users in `video` and leds for users in `input`. (done by default) 2) installing `brightnessctl` as a suid binary. +3) using the `systemd-logind` API. + The behavior is controlled by the `INSTALL_UDEV_RULES` flag (setting it to `1` installs the udev rules, it is the default value). +The systemd support (since v243) is controlled by the `ENABLE_SYSTEMD` flag (in that case it is recommended to set `INSTALL_UDEV_RULES` to 0). + ## Usage ``` Usage: brightnessctl [options] [operation] [value] |