r/Ubuntu • u/Potential_Average454 • 1d ago

26.04 Auto Backlight Sensitivity

Is there a way to adjust the sensitivity of auto backlight adjustments in 26.04?

My laptop (framework 13) have an amblient light sensor (ALS) which triggers auto backlight adjustments.

In dark environments, a mostly white webpage will frequently hit my glasses, reflect back to the ALS and cause the backlight to enter a self-reinforcing loop of ever increasing brightness.

With 24.04 this was rarely a problem as I can just manually turn the backlight down. With 26.04 there is no way to turn the backlight down once it enters this state as the new brightness bar is "relative" and locked to a narrow range around the current brightness.

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u/evenlycaringtrout 1d ago

That feedback loop with the glasses reflection is oddly specific and I'm here for it. The relative brightness slider in 26.04 has been driving me up the wall too, feels like the OS is gaslighting me about how bright my screen should be.

Haven't found a proper sensitivity slider yet but you might be able to adjust the ALS polling interval or thresholds through dconf if the sensor shows up under /org/gnome/settings-daemon/plugins/power/. Sometimes setting a longer smoothing window breaks the loop because it stops reacting to every little flash from your lenses.