Mercurial > backlight
view backlight.1 @ 23:6081cc143d37
backlight: add OpenBSD support
author | David Demelier <markand@malikania.fr> |
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date | Thu, 26 Mar 2020 12:35:53 +0100 |
parents | 232b390f1682 |
children | 25155025900d |
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.\" .\" Copyright (c) 2010-2020 David Demelier <markand@malikania.fr> .\" .\" Permission to use, copy, modify, and/or distribute this software for any .\" purpose with or without fee is hereby granted, provided that the above .\" copyright notice and this permission notice appear in all copies. .\" .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF .\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR .\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES .\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. .\" .Dd September 16, 2019 .Dt BACKLIGHT 1 .Os .\" NAME .Sh NAME .Nm backlight .Nd adjust screen brightness .\" SYNOPSIS .Sh SYNOPSIS .Nm .Ar decrease .Op Ar amount .Nm .Ar get .Nm .Ar increase .Op Ar amount .Nm .Ar set .Ar percentage .\" DESCRIPTION .Sh DESCRIPTION The .Nm tool adjust the brightness on your screen using direct access to ACPI video extension. .Pp The following commands are available: .Bl -tag -width 10n .It Cm decrease Decrease the specific .Ar amount percentage value (default: 10). .It Cm get Get the current level scaled to a percentage range. .It Cm increase Increase the specific .Ar amount percentage value (default: 10). .It Cm set Set brightness to the .Ar percentage value. .El .\" SYSTEM SUPPORT .Sh SYSTEM SUPPORT .Ss Linux On Linux, you need to have ACPI Video support either as module or built-in the kernel. .Pp You may use .Nm as non-root user if you create appropriate udev rules to make files under .Pa /sys/class/backlight writable by a group or per user. .Pp The source package comes with an example of udev rule that can be installed in .Pa /usr/lib/udev/rules.d . .Ss FreeBSD Access to brightness under FreeBSD requires super-user, you may need to run .Nm as root or use setuid permission for non-root users. .Pp You also need to load .Xr acpi_video 4 module at boot by adding .Sy acpi_video_load="YES" in .Pa /boot/loader.conf . .Ss OpenBSD On OpenBSD, the device .Pa /dev/ttyC0 must be writable in your user but this is normally the case when you login. Otherwise you may simply run the program as root. .Pp Note: you may need to specify a bigger .Ar amount with the .Cm increase, decrease commands if your system use small percentages. .\" AUTHORS .Sh AUTHORS .Nm was written by David Demelier <markand@malikania.fr>