# Gnome: Laptop backlight control

**URL:** <https://universal-blue.discourse.group/t/gnome-laptop-backlight-control/7125>\
**Category:** Bluefin\
**Created:** [February 28, 2025, 7:34am UTC](https://universal-blue.discourse.group/t/gnome-laptop-backlight-control/7125 "2025-02-28T07:34:21Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![akarypid](https://avatars.discourse-cdn.com/v4/letter/a/b5a626/32.png) [@akarypid](https://universal-blue.discourse.group/u/akarypid)\
**Post date:** [February 28, 2025, 7:34am UTC](https://universal-blue.discourse.group/t/gnome-laptop-backlight-control/7125/1 "2025-02-28T07:34:21Z")

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Hi all,

I have an issue with the backlight brightness slider in Gnome’s top-right panel menu. When I first boot my laptop, the slider is there and works fine. But at some point it disappears and I can no longer control screen brightness.

I was searching for this issue and found that both `/sys/class/backlight/intel_backlight/brightness` and `/sys/class/backlight/nvidia_0/brightness` (I have a laptop with a dGPU) seem to be fine. They still exist even though the slider disappeared, and I can even use them to control the backlight from command-line. So H/W and drivers seems to be fine, it’s just Gnome that has decided to hide the brightness slider. Furthermore the keyboard hotkeys also do not work so I cannot use the brightness keys (F5 and F6) to control brightness…

The only thing I can do is logout and log back into Gnome (no reboot necessary) and everything works fine again (the slider is back and I can control brighness with it as well as the keyboard keys).

Does anyone have any suggestions on how to debug Gnome’s behaviour about that slider? Is there something I can “reset” to make Gnome re-detect the slider without a logout/login (this would be a useful workaround).

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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/univeral_blue/original/2X/e/e39f7d1952979cf23b0f8d634e025fb38da50026.png) [@system](https://universal-blue.discourse.group/u/system)\
**Post date:** [May 29, 2025, 7:34am UTC](https://universal-blue.discourse.group/t/gnome-laptop-backlight-control/7125/2 "2025-05-29T07:34:25Z")

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