Porteus

Posted: **25 Jul 2022, 10:29**

Hello,

I can't change brightness of our (Intel)-Tablets via screen_settings parameter but I can change it from the command line:

xrandr --output DSI1 --brightness 0.5

Shall I use the run_command parameter instead?
Or is there another solution?

BR,
Michael

Posted: **25 Jul 2022, 10:59**

Michael,

Please provide an output of following command:

for x in `ls -1 /sys/class/backlight`; do echo $x; cat /sys/class/backlight/$x/brightness; cat /sys/class/backlight/$x/max_brightness; done

Thanks

Posted: **25 Jul 2022, 11:39**

This is the output:

acpi_video0
9
99
acpi_video1
0
99
acpi_video2
9
99
acpi_video3
9
99
acpi_video4
9
99
acpi_video5
9
99
acpi_video6
9
99

Posted: **25 Jul 2022, 12:12**

Please provide an output of following command:

for x in `ls -1 /sys/class/backlight`; do echo $((`cat /sys/class/backlight/$x/max_brightness`*23/100)) > /sys/class/backlight/$x/brightness; done

If no error is displayed then please update number '23' to anything else and check if brightness changes on the tablet.

Thanks

Posted: **25 Jul 2022, 12:51**

Doesn't change anything but I can also live with run_command/xrandr. Thought this might be a filthy hack and there might be something more elegant.

Posted: **25 Jul 2022, 13:08**

@brutus, OLED display?

Posted: **02 Aug 2022, 07:18**

No, it's an IPS display.