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-rw-r--r--man/systemd-backlight@.service.xml9
1 files changed, 8 insertions, 1 deletions
diff --git a/man/systemd-backlight@.service.xml b/man/systemd-backlight@.service.xml
index 453afbf1b4..21c6437efa 100644
--- a/man/systemd-backlight@.service.xml
+++ b/man/systemd-backlight@.service.xml
@@ -58,7 +58,14 @@
is a service that restores the display backlight
brightness at early boot and saves it at shutdown. On
disk, the backlight brightness is stored in
- <filename>/var/lib/systemd/backlight/</filename>.</para>
+ <filename>/var/lib/systemd/backlight/</filename>. During
+ loading, if udev property
+ <option>ID_BACKLIGHT_CLAMP</option> 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.</para>
</refsect1>
<refsect1>