Where can I download this?

Edward1978

Configuring Multiple Displays In Linux Using Arandr (Xrandr GUI)

brianthehughes

Software Station has arandr

sudo pkg install arandr at the command line should get you there too...

Edward1978

brianthehughes Where is it? It is downloaded. but I can't find it.

NitroNils

Edward1978 Did you try
whereis arandr ?
I suppose you mean where in the menu does it go?
Can you start it from the terminal?
Maybe you have to make an entry in the menu manually.

LizziAS

i installed it and found it listed in a couple places. under preferences and in the control center for mate right next to the display settings icon which works probably better than arandr...

LizziAS

also in the whisper menu under all right near the top. also system preferences hardware just above displays (which probably works better) in the mate classic menu....

if using a wm you may need to reboot

Edward1978

LizziAS I thought you could edit things like brightness/contraste/etc, I see no options?

LizziAS

honestly i dont know and ai is not giving me responses that look legit right now.

LizziAS

https://forums.ghostbsd.org/d/91-new-tool-brightness-control

this still a thing?

LizziAS

LizziAS pooh that is not still a thing

LizziAS

verified this one is working xcrsz/brightness-control @Edward1978

sudo pkg install ghostbsd-devel-tools

git clone xcrsz/brightness-control.git

cd brightness-control

sudo make install

brightness-control

Edward1978

LizziAS Anything to control contrast?

vimanuelt

LizziAS
Here is a better app: xcrsz/display-control

LizziAS

yes. try it

NitroNils

vimanuelt According to README there is supposed to be a display-control release on GitHub. Can't see it under "Releases".

LizziAS

brightness-control.jpg

display-control.jpg

Edward1978

The command to lower gamma would be good, Manjaro Mate I think I used.

Xgamma -0.40 to set to .40, but that was years ago. Xrndr -set gamma .40 right? Honestly thought arndr would do it.

vimanuelt

Edward1978

It (display-control) manages per-channel software gamma via xrandr, with both linked and independent RGB control, combined with brightness scaling and profile-based presets.

vimanuelt

If you read the source code for display-control, I have left notes about my research to make it a better utility. ;-) It is nice to have an app that benefits GhostBSD users. :-)

// main.go — Display Control with evidence-based circadian features
//
// Based on research showing that total luminance reduction (not blue-light
// filtering alone) is the effective lever for circadian health. See:
// - Phillips et al. (2019), PNAS — melatonin response to luminance
// - Mineault (2026), "Blue light filters don't work"
//
// Key insight: melanopsin (the circadian photopigment) responds broadly to
// cyan/blue/green light. Halving blue via Night Shift ≈ 0.3 log-unit change —
// a tiny blip on vision's 6-order dynamic range. Reducing overall brightness
// by 90%+ achieves the 1–2 order-of-magnitude swing that actually matters.

Edward1978

vimanuelt Just the command to change gamma will be good.

vimanuelt

Edward1978

Correct format: xrandr --output <DISPLAY> --gamma <R>:<G>:<B>
Example: xrandr --output DP-0 --gamma 0.3:0.3:0.3

From the xrandr man page:

--output output
Selects an output to reconfigure. Use either the name of the
output or the XID.

--gamma red[:green:blue]
Set the specified floating point values as gamma correction on the
crtc currently attached to this output. If green and blue are not
specified, the red value will be used for all three components.
Note that you cannot get two different values for cloned outputs
(i.e.: which share the same crtc) and that switching an output to
another crtc doesn't change the crtc gamma corrections at all.