├── 90-backlight.rules ├── COPYING.txt ├── Makefile ├── README.md ├── README.rst ├── xbacklight └── xbacklight.1 /90-backlight.rules: -------------------------------------------------------------------------------- 1 | # Allow video group to control backlight and leds 2 | SUBSYSTEM=="backlight", ACTION=="add", \ 3 | RUN+="/bin/chgrp video /sys/class/backlight/%k/brightness", \ 4 | RUN+="/bin/chmod g+w /sys/class/backlight/%k/brightness" 5 | SUBSYSTEM=="leds", ACTION=="add", KERNEL=="*::kbd_backlight", \ 6 | RUN+="/bin/chgrp video /sys/class/backlight/%k/brightness", \ 7 | RUN+="/bin/chmod g+w /sys/class/backlight/%k/brightness" 8 | -------------------------------------------------------------------------------- /COPYING.txt: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | prefix = /usr 2 | datarootdir = $(prefix)/share 3 | datadir = $(datarootdir) 4 | exec_prefix = $(prefix) 5 | bindir = $(exec_prefix)/bin 6 | mandir = $(datarootdir)/man 7 | man1dir = $(mandir)/man1 8 | sysconfdir = /etc 9 | 10 | .PHONY: install 11 | install: xbacklight xbacklight.1 90-backlight.rules 12 | $(NORMAL_INSTALL) 13 | install -vCDt $(DESTDIR)$(bindir) xbacklight 14 | install -vCDt $(DESTDIR)$(man1dir) xbacklight.1 15 | install -vCDt $(DESTDIR)$(sysconfdir)/udev/rules.d 90-backlight.rules 16 | $(POST_INSTALL) 17 | udevadm trigger -s backlight -c add 18 | 19 | .PHONY: uninstall 20 | uninstall: 21 | rm -f $(DESTDIR)$(bindir)/xbacklight 22 | rm -f $(DESTDIR)$(man1dir)/xbacklight.1 23 | rm -f $(DESTDIR)$(sysconfdir)/udev/rules.d/90-backlight.rules 24 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | **WARNING:** This repository has been migrated to GitLab: 2 | 3 | https://gitlab.com/wavexx/acpilight 4 | 5 | This github repository is no longer updated. 6 | -------------------------------------------------------------------------------- /README.rst: -------------------------------------------------------------------------------- 1 | acpilight: a backward-compatibile xbacklight replacement 2 | ======================================================== 3 | 4 | "acpilight" is a backward-compatibile replacement for xbacklight_ that uses the 5 | ACPI interface to set the display brightness. On modern laptops "acpilight" can 6 | control both display and keyboard backlight uniformly on either X11, the 7 | console or Wayland. 8 | 9 | 10 | Motivation 11 | ---------- 12 | 13 | On some modern laptops "XRandR" might lack the ability to set the display 14 | brightness. This capability was moved/unified to the kernel's ACPI interface, 15 | via ``/sys/class/backlight/``. 16 | 17 | "acpilight" provides a drop-in replacement for the ``xbacklight`` command that 18 | uses the ACPI interface instead of "XRandR", allowing old scripts to run. As a 19 | result, ``xbacklight`` can subsequently be used also from the console and 20 | Wayland (X11 is not used at all). 21 | 22 | When paired with the ddcci-backlight_ kernel module, the backlight of most 23 | professional external monitors can be controlled as well. 24 | 25 | 26 | Installation 27 | ------------ 28 | 29 | If you have ``make`` available, to install the executable, man page, and udev 30 | rules; run:: 31 | 32 | sudo make install 33 | 34 | Setup 35 | ----- 36 | 37 | Normally, users are prohibited to alter files in the ``sys`` filesystem. It's 38 | advisable (and *recommended*) to setup an "udev" rule to allow users in the 39 | "video" group to set the display brightness. 40 | 41 | To do so, place a file in ``/etc/udev/rules.d/90-backlight.rules`` containing:: 42 | 43 | SUBSYSTEM=="backlight", ACTION=="add", \ 44 | RUN+="/bin/chgrp video /sys/class/backlight/%k/brightness", \ 45 | RUN+="/bin/chmod g+w /sys/class/backlight/%k/brightness" 46 | 47 | to setup the relevant permissions at boot time. These rules are *very* 48 | conservative: only the display brightness can be controlled, and nothing else. 49 | **Do not set suid permissions on xbacklight!** Similarly, running 50 | ``xbacklight`` under ``sudo`` is pointless (there's simply no reason to). 51 | 52 | Keyboard backlight control is also available on certain laptop models via the 53 | "leds" subsystem. The following laptop models are known to have a controllable 54 | keyboard backlight: 55 | 56 | - Lenovo ThinkPad: ``-ctrl tpacpi::kbd_backlight`` 57 | - Apple MacBook Pro: ``-ctrl smc::kbd_backlight`` 58 | - Dell Latitude/XPS: ``-ctrl dell::kbd_backlight`` 59 | - Asus N-Series Notebooks: ``-ctrl asus::kbd_backlight`` 60 | 61 | The following rules allow users in the video group to set the keyboard 62 | backlight as well:: 63 | 64 | SUBSYSTEM=="leds", ACTION=="add", KERNEL=="*::kbd_backlight", \ 65 | RUN+="/bin/chgrp video /sys/class/backlight/%k/brightness", \ 66 | RUN+="/bin/chmod g+w /sys/class/backlight/%k/brightness" 67 | 68 | Please report if other laptops have working interfaces to control the keyboard 69 | backlight. 70 | 71 | If you have an external monitor with which supports the DDC/CI protocol, 72 | backlight control can be enabled by installing the `appropriate drivers 73 | `_ and loading the ``ddcci-backlight`` module at boot 74 | time. On Debian, this is done by installing the ``ddcci-dkms`` package 75 | and then appending ``ddcci-backlight`` to ``/etc/modules``. 76 | 77 | 78 | Differences from xbacklight 79 | --------------------------- 80 | 81 | The original "xbacklight" sets the display brightness of the current 82 | ``$DISPLAY``, whereas "acpilight" ignores ``$DISPLAY`` completely and sets the 83 | brightness of the first device found in ``/sys/class/backlight`` by default. On 84 | systems with multiple panels, they might differ. 85 | 86 | Use ``xbacklight -list`` to see the full list of available devices that can be 87 | controlled; then use the ``-ctrl`` flag to control them individually. 88 | 89 | "acpilight" can always *query*, but might not necessarily be allowed to *set* 90 | the brightness of all listed devices depending on the current user and 91 | permissions. See the setup section above to set the permissions correctly. 92 | 93 | "acpilight" doesn't fade: the requested brightness is set immediately by 94 | default. For smooth transitions, specify the number of fading steps (using 95 | ``-steps``) or, more conveniently, the fading frame rate (``-fps``). 96 | 97 | 98 | Authors and Copyright 99 | --------------------- 100 | 101 | "acpilight" can be found at https://gitlab.com/wavexx/acpilight 102 | 103 | | "acpilight" is distributed under GPLv3+ (see COPYING) WITHOUT ANY WARRANTY. 104 | | Copyright(c) 2016-2018 by wave++ "Yuri D'Elia" . 105 | 106 | .. _xbacklight: http://cgit.freedesktop.org/xorg/app/xbacklight 107 | .. _ddcci-backlight: https://gitlab.com/ddcci-driver-linux/ddcci-driver-linux 108 | -------------------------------------------------------------------------------- /xbacklight: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env python3 2 | # xbacklight: control backlight and led brightness on linux using the sys 3 | # filesystem with a backward-compatibile user interface 4 | # Copyright(c) 2016-2018 by wave++ "Yuri D'Elia" 5 | # -*- coding: utf-8 -*- 6 | from __future__ import print_function, division, generators 7 | 8 | APP_DESC = "control backlight brightness" 9 | SYS_PATH = ["/sys/class/backlight", "/sys/class/leds"] 10 | 11 | import argparse 12 | from collections import OrderedDict 13 | import os, sys 14 | import time 15 | 16 | 17 | def error(msg): 18 | print(sys.argv[0] + ": " + msg) 19 | 20 | def get_controllers(): 21 | ctrls = OrderedDict() 22 | for path in SYS_PATH: 23 | if os.path.isdir(path): 24 | for name in os.listdir(path): 25 | ctrls[name] = os.path.join(path, name) 26 | return ctrls 27 | 28 | def clamp(v, vmin, vmax): 29 | return max(min(v, vmax), vmin) 30 | 31 | 32 | class Controller(object): 33 | def __init__(self, path): 34 | self._brightness_path = os.path.join(path, "brightness") 35 | self._max_brightness = int(open(os.path.join(path, "max_brightness")).read()) 36 | 37 | def raw_brightness(self): 38 | return int(open(self._brightness_path).read()) 39 | 40 | def brightness(self): 41 | return self.raw_brightness() * 100 / self._max_brightness 42 | 43 | def set_raw_brightness(self, b): 44 | open(self._brightness_path, "w").write(str(int(round(b)))) 45 | 46 | def set_brightness(self, pc): 47 | self.set_raw_brightness(pc * self._max_brightness / 100) 48 | 49 | 50 | def sweep_brightness(ctrl, current, target, steps, delay): 51 | sleep = (delay / 1000.) / steps 52 | for s in range(1, steps): 53 | pc = current + (target - current) * s / steps 54 | ctrl.set_brightness(pc) 55 | time.sleep(sleep) 56 | ctrl.set_brightness(target) 57 | 58 | 59 | def pc(arg): 60 | if len(arg) == 0 or arg[0] not in '=+-0123456789': 61 | return None 62 | if arg[0] not in '=+-': 63 | arg = '=' + arg 64 | try: 65 | float(arg[1:]) 66 | except ValueError: 67 | return None 68 | return arg 69 | 70 | 71 | def main(): 72 | ap = argparse.ArgumentParser(description=APP_DESC, add_help=False) 73 | g = ap.add_mutually_exclusive_group(required=True) 74 | g.add_argument("-h", "-help", action="help", help="Show this help and exit") 75 | g.add_argument("-list", action="store_true", help="List controllers") 76 | g.add_argument("-getf", action="store_true", help="Get fractional brightness") 77 | g.add_argument("-get", action="store_true", help="Get brightness") 78 | g.add_argument("-set", metavar="PERCENT", type=float, help="Set brightness") 79 | g.add_argument("-inc", metavar="PERCENT", type=float, help="Increase brightness") 80 | g.add_argument("-dec", metavar="PERCENT", type=float, help="Decrease brightness") 81 | g.add_argument("pc", metavar="PERCENT", type=pc, nargs='?', 82 | help="[=+-]PERCENT to set, increase, decrease brightness") 83 | ap.add_argument("-ctrl", help="Set controller to use") 84 | ap.add_argument("-time", metavar="MILLISECS", type=int, 85 | default=200, help="Fading period (in milliseconds, default: 200)") 86 | g = ap.add_mutually_exclusive_group() 87 | g.add_argument("-steps", type=int, 88 | default=0, help="Fading steps (default: 0)") 89 | g.add_argument("-fps", type=int, 90 | default=0, help="Fading frame rate (default: 0)") 91 | ap.add_argument("-display", help="Ignored") 92 | args = ap.parse_args() 93 | 94 | # list controllers 95 | ctrls = get_controllers() 96 | if args.list: 97 | for name in ctrls: 98 | print(name) 99 | return 0 100 | 101 | # set current operating controller 102 | if args.ctrl is None: 103 | ctrl = Controller(next(iter(ctrls.values()))) 104 | else: 105 | if args.ctrl not in ctrls: 106 | error("unknown controller '{}'".format(args.ctrl)) 107 | return 1 108 | ctrl = Controller(ctrls[args.ctrl]) 109 | 110 | # uniform set arguments 111 | if args.pc is not None: 112 | v = float(args.pc[1:]) 113 | if args.pc[0] == '=': 114 | args.set = v 115 | elif args.pc[0] == '+': 116 | args.inc = v 117 | elif args.pc[0] == '-': 118 | args.dec = v 119 | if args.fps: 120 | args.steps = int((args.fps/1000) * args.time) 121 | 122 | # perform the requested action 123 | if args.getf: 124 | print(ctrl.brightness()) 125 | elif args.get: 126 | print(int(round(ctrl.brightness()))) 127 | else: 128 | current = ctrl.brightness() 129 | if args.set is not None: 130 | target = args.set 131 | elif args.inc is not None: 132 | target = current + args.inc 133 | elif args.dec is not None: 134 | target = current - args.dec 135 | target = clamp(target, 0, 100) 136 | if current == target: 137 | pass 138 | elif args.steps <= 1 or args.time < 1: 139 | ctrl.set_brightness(target) 140 | else: 141 | sweep_brightness(ctrl, current, target, args.steps, args.time) 142 | 143 | return 0 144 | 145 | 146 | if __name__ == "__main__": 147 | try: 148 | sys.exit(main()) 149 | except IOError as e: 150 | error(str(e)) 151 | sys.exit(1) 152 | -------------------------------------------------------------------------------- /xbacklight.1: -------------------------------------------------------------------------------- 1 | .TH XBACKLIGHT 1 1.0 2 | .SH NAME 3 | xbacklight \- adjust display and keyboard backlight using the /sys filesystem 4 | .SH SYNOPSIS 5 | .B xbacklight 6 | [\-h|\-help] [\-ctrl \fICTRL\fP] [\-display \fIIGNORED\fP] 7 | [\-time \fIMILLISECS\fP] [\-steps \fISTEPS\fP | \-fps \fIFPS\fP] ... 8 | .P 9 | .B xbacklight 10 | [flags] -list 11 | .br 12 | .B xbacklight 13 | [flags] -get | \-getf 14 | .br 15 | .B xbacklight 16 | [flags] \-set \fIPERCENT\fP | \-inc \fIPERCENT\fP | \-dec \fIPERCENT\fP 17 | .br 18 | .B xbacklight 19 | [flags] [=]\fIPERCENT\fP | +\fIPERCENT\fP | \-\fIPERCENT\fP 20 | .SH DESCRIPTION 21 | .I xbacklight 22 | can query or set the brightness of display and keyboard backlight. 23 | .I xbacklight 24 | operates on the first device found in /sys/class/backlight, unless told 25 | otherwise. Use \fI\-list\fP to see the full list of available devices that can 26 | be used; then use the \fI-ctrl\fP flag to control them individually. 27 | .SH QUERY OPERATIONS 28 | .IP \-list 29 | Print the list of controllable devices. 30 | .IP \-get 31 | Print out the backlight brightness as a percentage. 32 | .IP \-getf 33 | Same as \fI\-get\fP, but without rounding. 34 | .SH SET OPERATIONS 35 | The brightness can be set with either command flags or positional arguments. 36 | When changing brightness level, both integer and fractional values (as reported 37 | by \fI-get\fP and \fI-getf\fP respectively) are accepted. 38 | .P 39 | Regular set flags: 40 | .IP "\-set \fIPERCENT\fP" 41 | Sets the backlight brightness to the specified percentage level. 42 | .IP "\-inc \fIPERCENT\fP" 43 | Increases brightness by the specified amount. 44 | .IP "\-dec \fIPERCENT\fP" 45 | Decreases brightness by the specified amount. 46 | .P 47 | Set operations using positional arguments: 48 | .P 49 | .PD 0 50 | .IP "\fBxbacklight \fIPERCENT" 51 | .IP "\fBxbacklight \fI=PERCENT" 52 | .PD 53 | Set brightness (same as \fI\-set PERCENT\fP). 54 | .IP "\fBxbacklight \fI+PERCENT" 55 | Increase brightness (same as \fI\-inc PERCENT\fP). 56 | .IP "\fBxbacklight \fI-PERCENT" 57 | Decrease brightness (same as \fI\-dec PERCENT\fP). 58 | .SH OPTIONS 59 | .IP "-h, \-help" 60 | Print out a summary of the usage and exit. 61 | .IP "\-time \fIMILLISECONDS\fP" 62 | Length of time to spend fading the backlight between old and new value. 63 | Default is 200. Specifying either the number of fading steps 64 | (with \fI\-steps\fP) or fading frame rate (with \fI-fps\fP) is required to 65 | actually perform fading. 66 | .IP "\-steps \fISTEPS\fP" 67 | Number of fading steps. 68 | .IP "\-fps \fIFPS\fP" 69 | Target frame rate (frames/steps per second). 70 | .IP "\-display \fIIGNORED\fP" 71 | Ignored for backward compatibility. 72 | .IP "\-ctrl \fICONTROLLER\fP" 73 | Set the device name to operate on. 74 | .SH NOTES 75 | .B xbacklight 76 | doesn't lock the backlight device during fading. Running two concurrent fading 77 | operations will result in backlight flickering. 78 | .P 79 | The backlight of most panels cannot be changed at a rate higher than 20-30hz. 80 | Setting a high \fIFPS\fP value will not improve the transition smoothness 81 | beyond a certain point. 82 | .P 83 | Most keyboard's backlights have a very coarse resolution, with usually only 4 84 | brightness steps available. Supplying small relative increments will not 85 | effectively change the backlight illumination. Use large values (+30) or set 86 | absolute percentages directly (=70). 87 | .SH PORTABILITY 88 | This version of \fBxbacklight\fP is part of "acpilight" and contains 89 | several enhancements not available in the original version: 90 | .P 91 | The command-line flags \fI-list\fP, \fI-ctrl\fP, \fI-getf\fP and 92 | \fI-fps\fP do not exist in the original \fBxbacklight\fP. 93 | .P 94 | Fractional values are not allowed in the original \fBxbacklight\fP. 95 | .P 96 | The \fI=\fP (equals) is required by the original version when specifying 97 | an absolute brightness value, but can be omitted in this version. 98 | .SH AUTHORS 99 | .B xbacklight 100 | is part of \fIacpilight\fP (\fIhttps://gitlab.com/wavexx/acpilight\fP) and is 101 | distributed under GPLv3+ \fBWITHOUT ANY WARRANTY\fP. 102 | .br 103 | Copyright(c) 2016-2018 by wave++ "Yuri D'Elia" . 104 | --------------------------------------------------------------------------------