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acpi_video(4): mention that acpi_video should be loaded after any drm driver

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When not adhering to this order, brightness sysctl's do not show up on some
laptop.

Submitted by:	 driesm.michiels@gmail.com
Reviewed by:	uqs
Differential Revision:	https://reviews.freebsd.org/D26073
This commit is contained in:
Emmanuel Vadot 2020-11-04 13:43:34 +00:00
parent 4ceeb398bf
commit 4c18532bd0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=367328
1 changed files with 9 additions and 0 deletions
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9
share/man/man4/acpi_video.4
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@ -63,6 +63,15 @@ Preset brightness level to be used in economy mode.
Defaults for these variables can be set in
.Xr sysctl.conf 5 ,
which is parsed at boot-time.
.Sh COMPATIBILITY
In order for
.Nm
to attach correctly,
.Nm
should be loaded after any of the DRM kernel modules.
This can be achieved by setting the correct order in
.Xr rc.conf 5
using the kld_list directive.
.Sh SEE ALSO
.Xr acpi 4 ,
.Xr loader.conf 5 ,