Nvidia drivers screen brightness and back light

[Sergey Nasonov]

Hi,

Try to add line to xorg.conf in screen section
Option         "RegistryDwords" "EnableBrightnessControl=1"

This option allows backlight control over functionl keys Fn+F8/F9.   


On Wednesday 28 September 2016 14:18:18 blubee blubeeme wrote:
>Hi
>
>I am trying to tune this device a bit to be able to control the back light
>/ screen brightness of the screen.
>
>Here's the info on my GPU
>
>vgapci0 at pci0:1:0:0: class=0x030000 card=0x0130106b chip=0x0fe910de rev=0xa1
>hdr=0x00
>
>    vendor     = 'NVIDIA Corporation'
>
>    device     = 'GK107M [GeForce GT 750M Mac Edition]'
>
>    class      = display
>
>    subclass   = VGA
>
>    cap 01[60] = powerspec 3  supports D0 D3  current D0
>
>    cap 05[68] = MSI supports 1 message, 64 bit enabled with 1 message
>
>    cap 10[78] = PCI-Express 2 endpoint max data 256(256) RO NS
>
>                 link x8(x16) speed 8.0(8.0) ASPM L0s/L1(L0s/L1)
>
>    cap 09[b4] = vendor (length 20)
>
>    ecap 0002[100] = VC 1 max VC0
>
>    ecap 0004[128] = Power Budgeting 1
>
>    ecap 0001[420] = AER 2 0 fatal 0 non-fatal 0 corrected
>
>    ecap 000b[600] = Vendor 1 ID 1
>
>    ecap 0019[900] = PCIe Sec 1 lane errors 0
>
>
>Here is the acpi information for this machine : http://paste2.org/LUcIwtzn
>
>I came from running linux and typically there's a video or some acpi
>settings that will control the brightness of the screen but on FreeBSD,
>there doesn't seem to be anything like this so my monitor is constantly at
>100% brightness. Shouldn't there be some way to dim the brightness through
>the acpi interface?
>
>Can I get some support to be able to dim the screen brightness?
>
>Here is the output of my xorg.conf
>
># nvidia-xconfig: X configuration file generated by nvidia-xconfig
>
># nvidia-xconfig:  version 367.35  Wed Sep  7 17:03:49 CST 2016
>
>
>Section "ServerLayout"
>
>    Identifier     "Layout0"
>
>    Screen      0  "Screen0"
>
>    InputDevice    "Keyboard0" "CoreKeyboard"
>
>    InputDevice    "Mouse0" "CorePointer"
>
>EndSection
>
>
>Section "Files"
>
>EndSection
>
>
>Section "InputDevice"
>
>    # generated from default
>
>    Identifier     "Mouse0"
>
>    Driver         "mouse"
>
>    Option         "Protocol" "auto"
>
>    Option         "Device" "/dev/sysmouse"
>
>    Option         "Emulate3Buttons" "no"
>
>    Option         "ZAxisMapping" "4 5"
>
>EndSection
>
>
>Section "InputDevice"
>
>    # generated from default
>
>    Identifier     "Keyboard0"
>
>    Driver         "keyboard"
>
>EndSection
>
>
>Section "Monitor"
>
>    Identifier     "Monitor0"
>
>    VendorName     "Unknown"
>
>    ModelName      "Unknown"
>
>    HorizSync       28.0 - 33.0
>
>    VertRefresh     43.0 - 72.0
>
>    Option         "DPMS"
>
>EndSection
>
>
>Section "Device"
>
>    Identifier     "Device0"
>
>    Driver         "nvidia"
>
>    VendorName     "NVIDIA Corporation"
>
>EndSection
>
>
>Section "Screen"
>
>    Identifier     "Screen0"
>
>    Device         "Device0"
>
>    Monitor        "Monitor0"
>
>    DefaultDepth    24
>
>    SubSection     "Display"
>
>        Depth       24
>
>    EndSubSection
>
>EndSection
>
>
>I use redshift and passing redshift -t x:x -b[0.0-1.0] allows some
>brightness controls but then xrandr has to warm up and go from a cool color
>screen to a warmer color then it adjusts the brightness.
>
>
>There's also xrandr --ouput ACTIVE_DEVICE -brightness [0.0-1.0] this seems
>to work but it won't work while redshift is working. They seem to fight for
>control of the display then redshift takes control and the screen goes back
>to somewhat full brightness.
>
>
>Is there a more efficient way to control the screen brightness?
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