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Sysctl Brightness

Discussion in 'Mobile Computing' started by Draucia, Apr 20, 2012.

  1. Draucia

    Draucia New Member

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    I'm trying to change my laptop brightness (Toshiba l505). Fn keys don't work, but I don't mind. xbacklight doesn't work, and I can't seem to get sysctl to work. I've loaded acpi_video, but whenever I do:

    Code:
    sudo sysctl hw.acpi.video.<device>.active


    it says unknown oid. I've tried lcd, crt, tv, lcd0, crt0, and tv0 as the <device> and it always says unkown oid. I've also tried acpi_toshiba.

    I've tried:

    Code:
    sudo sysctl hw.acpi.toshiba.lcd_brightness=0


    But it still says unknown oid. This max brightness is hurting my eyes. x(


    Any help is appreciated.
     
  2. aa

    aa New Member

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    Just type sysctl hw.acpi to enumerate all recognized variables under hw.acpi
     
  3. DutchDaemon

    DutchDaemon Administrator Staff Member Administrator Moderator

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    I found that my laptop (not a Toshiba) does respond to the brightness Fn keys when in the BIOS. Try that.
     
    zeissoctopus thanks for this.
  4. Draucia

    Draucia New Member

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    When I do so, here is the output:

    Code:
     
    hw.acpi.supported_sleep_state: S3 S4 S5
    hw.acpi.power_button_state: S5
    hw.acpi.sleep_button_state: S3
    hw.acpi.lid_switch_state: NONE
    hw.acpi.standby_state: NONE
    hw.acpi.suspend_state: S3
    hw.acpi.sleep_delay: 1
    hw.acpi.s4bios: 0
    hw.acpi.verbose: 0
    hw.acpi.disable_on_reboot: 0
    hw.acpi.handle_reboot: 1
    hw.acpi.reset_video: 0
    hw.acpi.cpu.cx_lowest: C1
    hw.acpi.acline: 1
    hw.acpi.battery.life: 100
    hw.acpi.battery.time: -1
    hw.acpi.battery.state: 0
    hw.acpi.battery.units: 1
    hw.acpi.battery.info_expire: 5
    hw.acpi.thermal.min_runtime: 0
    hw.acpi.thermal.polling_rate: 10
    hw.acpi.thermal.user_override: 0
    hw.acpi.thermal.tz0.temperature: 47.0C
    hw.acpi.thermal.tz0.active: -1
    hw.acpi.thermal.tz0.passive_cooling: 1
    hw.acpi.thermal.tz0.thermal_flags: 0
    hw.acpi.thermal.tz0._PSV: 104.0C
    hw.acpi.thermal.tz0._HOT: -1
    hw.acpi.thermal.tz0._CRT: 104.0C
    hw.acpi.thermal.tz0._ACx: 70.0C -1 -1 -1 -1 -1 -1 -1 -1 -1
    hw.acpi.thermal.tz0._TC1: 2
    hw.acpi.thermal.tz0._TC2: 5
    hw.acpi.thermal.tz0._TSP: 300
    


    I don't understand. There is nothing related to brightness and anything related to hw.acpi.toshiba even though I did
    Code:
    kldload acpi_toshiba
    Am I doing something wrong?

    Tried it, doesn't work.
     
  5. Draucia

    Draucia New Member

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    I still haven't been able to solve this issue. Is it just not possible on my laptop because hw.acpi.video doesn't support it?
     
  6. JonathanBSD

    JonathanBSD New Member

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    I have the same laptop with the same problem, the only work around I found was installing the package xbrightness, download that, then in X type "xbrightness 22000" - I find that number to be a good setting, of course you can adjust the number to whatever you want.

    You can also then leave X and the brightness setting will remain until you next reboot.
     
    Draucia thanks for this.
  7. Draucia

    Draucia New Member

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    Wow this works great. It can lower the brightness more than the keys could. Thanks a lot. :)
     
  8. JonathanBSD

    JonathanBSD New Member

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    No problem. Also, since we have the same laptop, I wonder did you manage to get your RTL819 wireless card working with NDIS? I haven't managed to do it and I'm stuck with wired for now!
     
  9. Draucia

    Draucia New Member

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    RTL819 Wireless card? :O I have the Intel Wifi Link 5100AGN. I didn't have to do anything special to get this it work. My whole laptop model is L505 - S6959. You might have a model that's slightly different.
     
  10. Rul

    Rul New Member

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    excuse me cuz i'm noob
    im trying PCBSD for the first time, using 9.1RC1, have the same problem with brightness fn keys. I've followed this workarounds, and tried to install xbrightness, but don't know how. App cafe doesn't contain it, and /usr/ports/ doesn't exist in my 9.1RC1 installation,
    Would somebody be kind and give me some cable?. Thanx
     
  11. CanOfBees

    CanOfBees New Member

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    Hi Rul,

    1) First `su` to root
    su -
    2) and then add the binary package for xbrightness:
    pkg_add -r xbrightness
    3) After you've installed the package, run the command:
    xbrightness 9000 or something. :)

    Be careful what you install, though, as some ports/packages can interfere with the base system that PC-BSD uses. For more information about ports & packages, check out the FreeBSD handbook here: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/ports.html. Also, take a look at the PC-BSD handbook (here: http://wiki.pcbsd.org/index.php/PC-BSD_Users_Handbook) &, if you haven't, drop by the PC-BSD forums.

    Cheers!
     
  12. Rul

    Rul New Member

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    SOLVED! (not exactly), 9.1RC1 Toshiba brightness Fn keys don't work, but..
    sudo portsnap fetch
    sudo portsnap extract
    cd /usr/ports/x11/xbrightness
    sudo make install clean
    sudo xbrightness 33000 1.3
    http://disjunkt.com/xbrightness/

    Now i'm comfortable for rebuilding the whole code of this pretty OS, XDD
     
  13. franck-porcher

    franck-porcher New Member

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    Sysctl brightness all-in-one draft solution

    I was able to produce the following working solution :

    Though this solution now enables a perfect handling of my ThinkPad R61i brightness-up/brightness-down buttons, it will need to be tested and tuned against different hardware.

    1)First, configure the system to bring all the necessary modules needed to have the sysctl sub-system logically "maps" the available hardware as correctly as possible.

    In my case, I'm using a Lenovo ThinkPad R61i. The modules to access apci video variables are acpi_ibm and acpi_video. Check the available documentation to see which ones would be relevant for your particular hardware (generic acpi_<oem>)

    These modules need to be available and loaded. They could either be included in the built-in kernel, or be brought in at boot time thru via loader by adding the following lines in /boot/loader.conf :

    Code:
    # ACPI for IBM ThinkPad
    acpi_ibm_load="YES"
    acpi_video_load="YES"
    


    2)Second, configure the devd sub-system in order to properly capture the low-level events generated by pushing the brightness-up/brightness-down button.

    For my R61i, the brightness-up (resp. brightnes-down) button is Fn-16 (resp. Fn-17) that are propagated to the devd sub-system as ACPI event :Notify=0x10 (resp. Notify=0x11).

    Devd configuration I use to respond to these events and trigger the user-space code /usr/local/bin/acpi_ibm_exec.sh NOTIFY_EVENT OEM_NAME, where OEM name is "ibm" in my case (depends one the acpi_<oem> module loaded :

    /etc/devd.conf
    Code:
    # ACPI Brightness up/down trap for IBM Thinkpad
    notify 5 {
       match "system"          "ACPI";
       action "/usr/local/bin/acpi_generic_exec.sh $notify ibm";
    };
    


    Upon pressing the brightness-up button (Fn-16 -> 0x10 in hex) of my ThinkPad R61i, the typical call will be /usr/local/bin/acpi_ibm_exec.sh "0x10" ibm

    3) Third, provide the user-space software.

    /usr/local/bin/acpi_ibm_exec.sh is a (Bash) shell script which I put in /usr/local/bin for convenience. This shell script in turn calls the binary /usr/local/bin/xgradbrightness(1).

    This "compilation" was inspired by acpi_ibm(4) and xbrightness(1) :

    /usr/local/bin/acpi_ibm_exec.sh
    Code:
    #!/usr/local/bin/bash
    #
    # acpi_ibm_exec.sh
    # Usage: $0 event oem_name
    #
    # Copyright (C) 2012 Franck Porcher,Ph.D. <franck.porcher@franckys.com>
    export PATH="/bin:/usr/bin:/usr/local/bin:/sbin:/usr/sbin:/usr/local/sbin"
    
    if [ -z "$1" -o -z "$2" ]
    then
        echo "usage: $0 acpi_event oem_name"
        exit 1
    fi
    
    NOTIFY=$(echo $1)
    
    case ${NOTIFY} in
        0x10) #(Fn-10) BRIGHTNESS UP
              possible_levels_asc=( $(  sysctl -n hw.acpi.video.lcd0.levels     \
                                      | while read -d ' ' x; do echo "$x"; done \
                                      | sort -nu
                                   ))
              actual_level=$(sysctl -n hw.acpi.video.lcd0.brightness)
              i=0
              max_i=${#possible_levels_asc[@]}
              while (( i < max_i ))
              do
                if (( actual_level == ${possible_levels_asc} ))
                then
                    if (( i == (max_i - 1) ))
                    then
                        xgradbrightness max
                    else
                        actual_level=${possible_levels_asc[i + 1]}
                        if xgradbrightness $((65535 * actual_level / 100))
                        then
                            sysctl hw.acpi.video.lcd0.brightness=$actual_level
                        fi
                    fi
                    break
                else
                    (( i++ ))
                fi
              done
              ;;
    
        0x11) #(Fn-11) BRIGHTNESS DOWN
              possible_levels_desc=( $(  sysctl -n hw.acpi.video.lcd0.levels     \
                                       | while read -d ' ' x; do echo "$x"; done \
                                       | sort -rnu
                                    ))
              actual_level=$(sysctl -n hw.acpi.video.lcd0.brightness)
              i=0
              max_i=${#possible_levels_desc[@]}
              while (( i < max_i ))
              do
                if (( actual_level == ${possible_levels_desc} ))
                then
                    if (( i == (max_i - 1) ))
                    then
                        xgradbrightness min
                    else
                        actual_level=${possible_levels_desc[i + 1]}
                        if xgradbrightness $((65535 * actual_level / 100))
                        then
                            sysctl hw.acpi.video.lcd0.brightness=$actual_level
                        fi
                    fi
                    break
                else
                    (( i++ ))
                fi
              done
              ;;
    
            *)
             ;;
    esac
    


    xgradbrightness.c
    Code:
    /*
     * LICENCE TYPE : BSD
     *
     * Copyright 2012 Franck Porcher, Ph.D <franck.porcher@franckys.com>
     * Inspired by x11/xbrightness (see x11/xbrightness/work/AUTHORS)
     */
    
    #include <ctype.h>
    #include <errno.h>
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <X11/Xos.h>
    #include <X11/Xlib.h>
    #include <X11/Xutil.h>
    #include <X11/extensions/xf86vmode.h>
    #include <math.h>
    
    #define BRIGHTNESS_MAX      65535
    #define BRIGHTNESS_MIN      0
    #define BRIGHTNESS_DEFAULT  65535
    #define STEPS_DEFAULT       5000
    #define DISPLAY_DEFAULT     ":0"
    
    /*
     * Usage
     */
    static void usage(char *arg) {
        fprintf (stderr, "%s builds a brightness ramp for X11.\n\n", arg);
        fprintf (stderr, "Usage:  %s [-h] [BRIGHTNESS] [STEP] [DISPLAY] \n", arg);
        fprintf (stderr, "Where :\n");
        fprintf (stderr, "    - BRIGHTNESS is the requested brightness. It can be a number from 0 to 65535, the word 'max' or the word 'min' (de
    faults to max)\n");
        fprintf (stderr, "    - STEPS      is the number of steps (>= 1) to step-by-step progressively adjust the screen to the requested bright
    ness (defaults to 5000)\n");
        fprintf (stderr, "    - DISPLAY    is the name of the X11 display to use (defaults to :0)\n\n");
        fprintf (stderr, "Copyright(C) Franck Porcher, Ph.D <franck.porcher@franckys.com>.\n");
        exit(0);
    }
    
    /*
     * Main
     */
    int main(int argc, char *argv[]) {
        Display *dpy;
        int i,j;
        int screen, ramp_size;
        unsigned short *ramp;
        double level, delta_level;
        double brightness, delta_step;
    
        /**** Defaults ****/
        unsigned short brightness_requested = BRIGHTNESS_MAX;
        unsigned short steps = STEPS_DEFAULT;
        char *display = DISPLAY_DEFAULT;
    
        /**** Parameters ****/
        if (argc >= 2) {
            if (! strcmp(argv[1], "-h")) {
                usage(argv[0]);
            }
    
            if (! strcmp(argv[1], "max")) {
                brightness_requested = BRIGHTNESS_MAX;
            }
            else if (! strcmp(argv[1], "min")) {
                brightness_requested = BRIGHTNESS_MIN;
            }
            else {
                brightness_requested = atoi(argv[1]);
            }
        }
    
        if (argc >= 3) {
            steps = atoi(argv[2]);
        }
    
        if (argc >= 4) {
           display = argv[3];
        }
    
        /**** Setup ****/
        if ( (dpy = XOpenDisplay(display)) == NULL) {
            fprintf (stderr, "%s: unable to open default display '%s'.\n", argv[0], display);
            exit(1);
        }
        screen = DefaultScreen(dpy);
    
        /**** main portion ****/
        if (   XF86VidModeGetGammaRampSize(dpy, screen, &ramp_size )
            && (ramp = (unsigned short *) malloc(ramp_size * sizeof(unsigned short)))
            && XF86VidModeGetGammaRamp(dpy, screen, ramp_size, ramp, ramp, ramp)
        ) {
            /* "steps" steps by step progressive monitor's screen brightness adjustment.
             *  from "actual brightness", given by ramp[ramp_size-1],
             *  to   "requested brightness", given by 1st argument
             */ 
    
            brightness = (double)ramp[ramp_size-1];
            delta_step = ((double)brightness_requested - brightness)/steps;
    
            for (j=0; j<steps; j++) {
                brightness += delta_step;   /* progressive goal */
    
                delta_level = brightness/(ramp_size-1);
                level = 0.0;
                /* ramp[0] is always 0 whatever brightness,
                 * so we start modifying ramp at index 1,
                 * saving tiny fractions of precious time
                 */
                for (i=1; i<ramp_size; i++) {
                    level  += delta_level;
                    ramp = (unsigned short)level;
                }
                XF86VidModeSetGammaRamp(dpy, screen, ramp_size, ramp, ramp, ramp);
            }
        }
        XCloseDisplay(dpy);
        exit(0);
    }
    


    Imakefile
    Code:
            DEPLIBS = $(DEPXXF86VMLIB) XawClientDepLibs
      SYS_LIBRARIES = MathLibrary
    LOCAL_LIBRARIES = $(XXF86VMLIB) XawClientLibs
               SRCS = xgradbrightness.c 
               OBJS = xgradbrightness.o
    
    ComplexProgramTarget(xgradbrightness)
    


    INSTALL
    Code:
    xmkmf && make && make install
    


    Wish you good success. Please report your mileage, your experience, and your suggestions.
    This could become a tiny package on its own.

    FP.
     
  14. franck-porcher

    franck-porcher New Member

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    Forgot to mention that the script being called by sys daemons, you'll have to give them the right to access your X display, that is (though you will remember that when you push your brighten-up/down buttons and see nothing happening...�e ):

    Code:
    # Log into your CLI, then
    [~user]$ xhost + 
    


    There might be a better way, but I do not know it...

    Cheers

    --FP.