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Dole15
Copper

XPS 9550 - Function keys cannot adjust brightness on battery, but can adjust everywhere else (action center, power settings)

Using the laptop on battery, when I press on F11-12, the brightness meter is shown on the upper left like usual, but it won't move up or down.  Yet I think it's strange that all other places I can adjust brightness are fine, and especially strange that everything is working totally fine on AC power.


I tried uninstalling the Generic PnP monitor and reinstalling, but to no results.  Also, both my power settings on battery and on power indicate no adaptive brightness.

1 Reply
Moderator
Moderator

RE: XPS 9550 - Function keys cannot adjust brightness on battery, but can adjust everywhere else (action center, power settings)

The fact that it works on AC adapter means that this is strictly a software driver issue or operating system issue. Not a laptop hardware issue. Reinstall the chipset drivers (7) one at a time, restarting after each one. Then reinstall the Dell Command Power Manager, restart and retest.

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