X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=man%2Fsystemd-backlight%40.service.xml;h=21c6437efab4d277a800cd6dea607c5703ffaeb0;hb=5fae368bda9419d9d378ea32077c8fd183dd4b81;hp=4318964dcaf9ff39f2eb93cb7e597432cf8c5afa;hpb=6c8c92fef72cf6a7ef7109a424ef82dbdc4f6952;p=elogind.git
diff --git a/man/systemd-backlight@.service.xml b/man/systemd-backlight@.service.xml
index 4318964dc..21c6437ef 100644
--- a/man/systemd-backlight@.service.xml
+++ b/man/systemd-backlight@.service.xml
@@ -56,11 +56,37 @@
systemd-backlight@.service
is a service that restores the display backlight
- brightness at early-boot and saves it at shutdown. On
+ brightness at early boot and saves it at shutdown. On
disk, the backlight brightness is stored in
- /var/lib/systemd/backlight/. Note that by
- default, only firmware backlight devices are
- saved/restored.
+ /var/lib/systemd/backlight/. During
+ loading, if udev property
+ is not set to
+ false value, the brightness is clamped to a value of
+ at least 1 or 5% of maximum brightness, whichever is
+ greater. This restriction will be removed when the
+ kernel allows user space to reliably set a brightness
+ value which does not turn off the display.
+
+
+
+ Kernel Command Line
+
+ systemd-backlight understands
+ the following kernel command line parameter:
+
+
+
+ systemd.restore_state=
+
+ Takes a boolean
+ argument. Defaults to
+ 1. If
+ 0, does not restore
+ the backlight settings on boot. However,
+ settings will still be stored on shutdown.
+
+
+