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Inspiron 17 7779 - Stuck screen backlight/brightness

For the past few weeks my Inspiron 17 (7779) has been unable to change its screen brightness after waking from sleep/suspend mode.

When lifting the lid after a few hours in sleep, the screen backlight seems to be stuck at 50% and changing the brightness via hotkeys or the settings slider has no effect. Restarting the laptop brings back the functionality.

I've tried reinstalling the Intel HD graphics driver to the latest provided by Dell (
I've also tried reinstalling the nvidia driver to the latest provided (

but the problem still persists.

Is this an issue for anyone else?

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