Display brightness

[Member ben]

Hello,

unfortunately I can not adjust the brightness on my new screen. The monitor is connected via a DisplayPort cable.

I use IceWM.

How can I quickly change the brightness with a GUI?
I have to do this several times a day when the lighting conditions change. at night the monitor dazzles and during the day, it must not be too dark, otherwise I see nothing.

The “Screelight” app unfortunately does not work in terms of brightness. i can change the fab temperature with it. that works. But brighter and darker does not work.

I have installed a driver for displayport (ddcci), but still does not work.

Translated with http://www.DeepL.com/Translator (free version)

[Moderator caprea]

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Does backlight-brightness work for you?
menu > application > antiX > backlight-brightness

or from terminal
x-terminal-emulator -e backlight-brightness

[Member ben]

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I get the message
“backlight-brightness: No controller found”

[Moderator caprea]

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Please post your hardware
inxi -Fxz
Also, did you already try another kernel ?

[Member Xecure]

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Using screenlight tool installed in antiX:
screenlight-menu.sh
Select the third option “Change and Apply the day values” and manually set the brightness percentage (for example, “30” for 30%).
Then save the file and close it. Then hit “Apply the current configured day values” option and it should change the screen brightness.

If this doesn’t work (doesn’t work with all external monitors).

For external monitors, using the terminal

See all connected monitors:
xrandr | grep " connected" | awk '{print $1}'

and use xrandr to change the brightness of one of them. Example for HDMI-1, setting brightness to 50%:
xrandr --output HDMI-1 --brightness 0.5

For external monitors, using lxqt-config dialogs
Install lxqt-config package:
sudo apt install lxqt-config

And either launch it from the menus or from the terminal
lxqt-config-brightness

Let us know if this still doesn’t work for you. We may be able to find an alternative.

• This reply was modified 1 year, 4 months ago by Xecure.

antiX Live system enthusiast.
General Live Boot Parameters for antiX.

[Member sybok]

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Hi,

BTW, search in the forum ‘brightness screenlight’
https://www.antixforum.com/forums/search/brightness+screenlight/
produces several results (displayed on two pages) with some of them already discussing the same issue (though the cause may be different).

• This reply was modified 1 year, 4 months ago by sybok. Reason: quantify search results

[Member blur13]

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Thanks Xecure!

“xrandr –output HDMI-1 –brightness 0.5”

I had the same issue and just assumed that the monitor brightness had to be changed using the touchcontrols on the monitor itself. Those controls are not that responsive anymore and a hassle to use so this is a much better way to go about it!

[Member ModdIt]

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Important comment, there is a risk of noise, sometimes called snow if you give a monitor an input level set too low.
This is more a problem with older devices but I can make my monitor produce a terrible image, it is not so old,
has refurbished power supply, and is capable of excellent full HD at 60Hz.

[Member ben]

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My hardware

System:
Kernel: 4.9.235-antix.1-amd64-smp x86_64 bits: 64 compiler: gcc v: 8.3.0
Desktop: IceWM 2.9.2
Distro: antiX-19.3_x64-full Manolis Glezos 15 October 2020
base: Debian GNU/Linux 10 (buster)
Machine:
Type: Desktop System: Dell product: Precision WorkStation T5500 v: N/A
serial: <filter>
Mobo: Dell model: 0CRH6C v: A02 serial: <filter> BIOS: Dell v: A18
date: 10/15/2018
CPU:
Info: 6-Core model: Intel Xeon X5670 bits: 64 type: MT MCP arch: Nehalem
rev: 2 cache: L2: 12 MiB
flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 70226
Speed: 1596 MHz min/max: 1596/2927 MHz boost: enabled Core speeds (MHz):
1: 1596 2: 1596 3: 1596 4: 1596 5: 1596 6: 1596 7: 2394 8: 1729 9: 1596
10: 1596 11: 1596 12: 1596
Graphics:
Device-1: NVIDIA GF106GL [Quadro 2000] driver: nouveau v: kernel
bus-ID: 03:00.0
Display: x11 server: X.Org 1.20.4 driver: loaded: modesetting
unloaded: fbdev,vesa resolution: 2048×1152
OpenGL: renderer: NVC3 v: 4.3 Mesa 18.3.6 direct render: Yes
Audio:
Device-1: Intel 82801JI HD Audio vendor: Dell driver: snd_hda_intel
v: kernel bus-ID: 00:1b.0
Device-2: NVIDIA GF106 High Definition Audio driver: snd_hda_intel
v: kernel bus-ID: 03:00.1
Sound Server-1: ALSA v: k4.9.235-antix.1-amd64-smp running: yes
Sound Server-2: PulseAudio v: 12.2 running: no
Network:
Device-1: Broadcom Limited NetXtreme BCM5761 Gigabit Ethernet PCIe
vendor: Dell driver: tg3 v: 3.137 port: dc80 bus-ID: 06:00.0
IF: eth0 state: up speed: 100 Mbps duplex: full mac: <filter>
Device-2: Qualcomm Atheros AR5212/5213/2414 Wireless Network Adapter
vendor: D-Link System AirPlus DWL-G520 driver: ath5k v: kernel port: dc80
bus-ID: 07:04.0
IF: wlan0 state: down mac: <filter>
Drives:
Local Storage: total: 1.36 TiB used: 455.53 GiB (32.6%)
ID-1: /dev/sda vendor: Seagate model: ST1000DM003-1ER162 size: 931.51 GiB
ID-2: /dev/sdb vendor: Western Digital model: WD5000AAKX-22ERMA0
size: 465.76 GiB
Partition:
ID-1: / size: 97.93 GiB used: 21.77 GiB (22.2%) fs: ext4 dev: /dev/sda3
Swap:
Alert: No swap data was found.
Sensors:
System Temperatures: cpu: 28.0 C mobo: 19.0 C gpu: nouveau temp: 47.0 C
Fan Speeds (RPM): cpu: 810 mobo: 1133 gpu: nouveau fan: 2670
Info:
Processes: 283 Uptime: 4m Memory: 47.23 GiB used: 1.61 GiB (3.4%)
Init: SysVinit runlevel: 5 Compilers: gcc: 8.3.0 Packages: 2222
Shell: Bash v: 5.0.3 inxi: 3.3.06

[Member ben]

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Like i said in the beginning “screenlight-menu.sh” works only for the colour temperature, but not for the screen brightness.

[Member ben]

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Great.

this worked

xrandr –output DP-2 –brightness 0.5

[Member ben]

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Thank you very much for you help and thanks to everyone for the support 🙂

[Member ben]

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BTW the monitor has no working touch controls for brightness if the displayport is connected. To use them would have been the easiest way.

[Member sybok]

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FYI, I was inspired by the set of commands mentioned by @Xecure and I set up a simple function for a single monitor.
I put it into my ‘~/.bashrc’ and call it from the command-line e.g. as follows ‘set_brightness 0.6’.

Comments/Limitations:
– It handles a single monitor (which suffices my needs).
– It interferes with ‘redshift’ which effectively behaves as if temporarily disabled/paused (does not seem to be the case at home [antiX testing] but only at work [antiX stable]).

set_brightness(){
  local bright
  local output

  bright="$*"

  if ! [[ "${bright}" =~ ^[0-9]+(.[0-9]+)?$ ]]; then
    echo "Passed brightness value [${bright}] is not a float - won't do [return]"
    return
  fi

  output="$(xrandr | grep '\<connected\>' | awk ' { print $1 } ')" # Grep for a complete word
  if [ "$(echo "${output}" | wc -l)" -gt 1 ]; then
    echo "Too many monitors connected - won't do [return]"
    return
  fi

  xrandr --output "${output}" --brightness "${bright}"
} # set_brightness

Edit: Damn, seems to be overriden at the work-PC after few seconds (when ‘redshift’ catches up). 🙁

• This reply was modified 1 year, 3 months ago by sybok.

[Member PPC]

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sybok wrote:

seems to be overriden at the work-PC after few seconds (when ‘redshift’ catches up)

Don’t get discoraged by that- the user can always disable redshift! Very nice use of grep and awk – this can be adapted to edit any change to the screen (not only brightness). Slap a simple yad window as an interface of this script, and you’ll have a nice and easy GUI!

P.

Edit: I just tested this, straight from the terminal and it did wonders, saving my eyes from a too bright display!

Tip for anyone that wants to test this script to select screen brightness: Menu > Terminal > copy and paste the script on the previous post. Press enter. Now, for that terminal session the function “set_brightness” will work just like it was a command. Entering in that terminal window this command, will set the brightness to 50%:

set_brightness 0.5

To set brightness to 100%:

set_brightness 1

Please note that the brightness change sticks even after you close the terminal.

• This reply was modified 1 year, 3 months ago by PPC.

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