[SOLVED] Monitor brightness

ferrari · 11-03-2014, 06:46 PM

Quote:

It did!. Now in system setting I have a bar, that I can move and change the brightness!. Thanks man, your'e awesomest

Fantastic! I'm glad to have been of help.

Quote:

I owe you a beer.

I'll remember that

subhrajitm20 · 09-28-2022, 08:46 AM

Quote:

Originally Posted by orcaja

It worked!. Now in system settings I have a bar, that I can move and change the brightness!. Thanks man, your'e the awesomest

I owe you a beer.

/Joc

I am still unable to control the screen brightness. Can you please mention how you finally figured out the way. Can you tell the flow of commands used. Thanks in advance

ferrari · 09-28-2022, 01:29 PM

Best to start your own new thread, rather than tacking on to an eight year old thread like this. Lots will have changed, and you also need to provide relevant hardware details.

mrmazda · 10-01-2022, 07:14 PM

Code:

> inxi -Gxx
Graphics:
  Device-1: Intel 4th Generation Core Processor Family Integrated Graphics
    vendor: Micro-Star MSI driver: i915 v: kernel arch: Gen-7.5 ports:
    active: HDMI-A-1 empty: HDMI-A-2,VGA-1 bus-ID: 00:02.0 chip-ID: 8086:041e
  Display: x11 server: X.Org v: 1.20.3 driver: X: loaded: modesetting
    unloaded: fbdev,vesa alternate: intel gpu: i915 display-ID: :0 screens: 1
  Screen-1: 0 s-res: 1920x1200 s-dpi: 120
  Monitor-1: HDMI-A-1 mapped: HDMI-1 model: Samsung SMS24A850
    res: 1920x1200 dpi: 94 diag: 611mm (24.1")
  OpenGL: renderer: Mesa Intel HD Graphics 4400 (HSW GT2) v: 4.6 Mesa
    21.2.4 compat-v: 3.1 direct render: Yes

Above describes my graphics, similar to OP's. Below makes my display output much darker.

Code:

> xrandr --output HDMI-1 --brightness 0.7

Normal brightness is restored by a setting of 1.0.

Emerson · 10-01-2022, 09:33 PM

Not exactly the same thing, but after setting up redshift and tuning it properly I do not need to adjust it by hand any more.

Emerson · 10-01-2022, 09:41 PM

Then there is ddcutil, it can communicate with monitor and change quite a few values. See below, it is ddcutil run on one of my displays.

Code:

# ddcutil getvcp KNOWN
VCP code 0x02 (New control value             ): One or more new control values have been saved (0x02)
VCP code 0x0b (Color temperature increment   ): 100 degree(s) Kelvin
VCP code 0x0c (Color temperature request     ): 3000 + 100 * (feature 0B color temp increment) degree(s) Kelvin
VCP code 0x10 (Brightness                    ): current value =    40, max value =   100
VCP code 0x12 (Contrast                      ): current value =    60, max value =   100
VCP code 0x14 (Select color preset           ): !!! UNABLE TO FORMAT OUTPUT. mh=0x00, ml=0x0b, sh=0x00, sl=0x00
VCP code 0x16 (Video gain: Red               ): current value =   100, max value =   100
VCP code 0x18 (Video gain: Green             ): current value =   100, max value =   100
VCP code 0x1a (Video gain: Blue              ): current value =   100, max value =   100
VCP code 0x1e (Auto setup                    ): Auto setup not active (sl=0x00)
VCP code 0x52 (Active control                ): Value: 0x62
VCP code 0x60 (Input Source                  ): Invalid value (sl=0x00)
VCP code 0x62 (Audio speaker volume          ): Volume level: 60 (00x3c)
VCP code 0x6c (Video black level: Red        ): current value =    50, max value =   100
VCP code 0x6e (Video black level: Green      ): current value =    50, max value =   100
VCP code 0x70 (Video black level: Blue       ): current value =    50, max value =   100
VCP code 0x86 (Display Scaling               ): Linear expansion (compression) on h and v axes (sl=0x08)
VCP code 0x8d (Audio mute/Screen blank       ): Unmute the audio (sl=0x02), Invalid value (sh=0x00)
VCP code 0xac (Horizontal frequency          ): 23364 hz
VCP code 0xae (Vertical frequency            ): 60.00 hz
VCP code 0xb6 (Display technology type       ): LCD (active matrix) (sl=0x03)
VCP code 0xc0 (Display usage time            ): Usage time (hours) = 8983 (0x002317) mh=0xff, ml=0xff, sh=0x23, sl=0x17
VCP code 0xc6 (Application enable key        ): 0x006f
VCP code 0xc8 (Display controller type       ): Mfg: Mstar (sl=0x05), controller number: mh=0xff, ml=0x16, sh=0x00
VCP code 0xc9 (Display firmware level        ): 0.1
VCP code 0xca (OSD/Button Control            ): OSD enabled, button events enabled (sl=0x02), Host control of power unsupported (sh=0x00)
VCP code 0xcc (OSD Language                  ): English (sl=0x02)
VCP code 0xd6 (Power mode                    ): DPM: On,  DPMS: Off (sl=0x01)
VCP code 0xdf (VCP Version                   ): 2.2

Emerson · 10-01-2022, 09:48 PM

And another utility, does the same, ddccontrol.

I use these utilities to switch the input, I have Mac Mini connected to my main monitor, when I want to use it then instead of going into clumsy menus I issue a saved command. Then, when I'm finished with Mac I execute proper command from there to switch back to my Gentoo desktop.

Code:

= VESA standard monitor
> Color settings
        > Brightness and Contrast
                > id=brightness, name=Brightness, address=0x10, delay=-1ms, type=0
                  supported, value=75, maximum=100
                > id=contrast, name=Contrast, address=0x12, delay=-1ms, type=0
                  supported, value=75, maximum=100
        > Color maximum level
                > id=red, name=Red maximum level, address=0x16, delay=-1ms, type=0
                  supported, value=100, maximum=100
                > id=green, name=Green maximum level, address=0x18, delay=-1ms, type=0
                  supported, value=100, maximum=100
                > id=blue, name=Blue maximum level, address=0x1a, delay=-1ms, type=0
                  supported, value=100, maximum=100
> Position and size
        > Position
                > id=hpos, name=Horizontal Position, address=0x20, delay=-1ms, type=0
                  supported, value=50, maximum=100
                > id=vpos, name=Vertical Position, address=0x30, delay=-1ms, type=0
                  supported, value=50, maximum=100
        > Automatic adjustments
                > id=auto, name=Automatically adjust, address=0x1e, delay=1000ms, type=1
                  Possible values:
                        > id=pos - name=H/V Position, value=1
                  supported, value=0, maximum=1
> Screen purity
        > Image setup
                > id=coarse, name=Image Lock Coarse (Clock), address=0xe, delay=-1ms, type=0
                  supported, value=50, maximum=100
                > id=fine, name=Image Lock Fine (Clock Phase), address=0x3e, delay=-1ms, type=0
                  supported, value=83, maximum=100
> Input settings
        > Input sources
                > id=inputsource, name=Input Source Select (Main), address=0x60, delay=-1ms, type=2
                  Possible values:
                        > id=analog - name=Analog, value=1
                        > id=digital - name=Digital, value=3
                  supported, value=1, maximum=4
> Others
        > Restore defaults
                > id=defaults, name=Restore Factory Defaults, address=0x4, delay=2000ms, type=1
                  Possible values:
                        > id=default - name=Restore Factory Defaults, value=1
                  supported, value=0, maximum=1
                > id=defaultluma, name=Restore Brightness and Contrast, address=0x5, delay=2000ms, type=1
                  Possible values:
                        > id=default - name=Restore Brightness and Contrast, value=1
                  supported, value=0, maximum=1
                > id=defaultgeom, name=Restore Factory Default Geometry, address=0x6, delay=2000ms, type=1
                  Possible values:
                        > id=default - name=Restore Factory Default Geometry, value=1
                  supported, value=0, maximum=1
                > id=defaultcolor, name=Restore Factory Default Color, address=0x8, delay=2000ms, type=1
                  Possible values:
                        > id=default - name=Restore Factory Default Color, value=1
                  supported, value=0, maximum=1
        > OSD
                > id=newcontrolvalue, name=New Control Value, address=0x2, delay=-1ms, type=2
                  Possible values:
                        > id=nochanges - name=No changes, value=1
                        > id=changed - name=Some values changed, value=2
                  supported, value=1, maximum=2
        > Power control
                > id=dpms, name=DPMS Control, address=0xd6, delay=-1ms, type=2
                  Possible values:
                        > id=on - name=On, value=1
                        > id=standby - name=Standby, value=4
                  supported, value=1, maximum=5