Brightness does not work iMac 2010

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1

Hello everyone, I hope this post is in the right place. I’m having trouble adjusting my screen brightness. The brightness slider doesn’t change anything. I’m using Fedora on a 2010 iMac.

When I put the brightness slider to minimum

cat /sys/class/backlight/acpi_video0/brightness gives me 1

When I put the brightness slider to the max

cat /sys/class/backlight/acpi_video0/brightness gives me 16

so if I understand correctly the scale is from 1 to 16 but the brightness does not change with the slider.

I also tried xrandr --listactivemonitors the result is :

Monitors: 10: +*eDP-1 1920/480x1080/270+0+0 eDP-1

but xrandr --output eDP-1 --brightness or xrandr --output eDP-1 --gamma with values does not change nothing.

I’m a bit lost because with my old Linux (Mint or Ubuntu) xrandr worked.

Thanks in advance for your help, here is my configuration :

Hardware Information:

  • Hardware Model: Apple Inc. iMac11,2
  • Memory: 8.0 GiB
  • Processor: Intel® Core™ i5 680 × 4
  • Graphics: AMD REDWOOD
  • Disk Capacity: 1.5 TB

Software Information:

  • Firmware Version: IM112.88Z.005D.B00.1804101436
  • OS Name: Fedora Linux 42 (Workstation Edition)
  • OS Build: (null)
  • OS Type: 64-bit
  • GNOME Version: 48
  • Windowing System: Wayland
  • Kernel Version: Linux 6.15.10-200.fc42.x86_64
3

as you are using gnome please have a look at Gnome extensions for Brightness control.

i use the soft brightness Gnome extension which works very well.

best of luck, Steve ..

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4

Thank you so much for your help :saluting_face: I have been looking for a solution for so long :grimacing:

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