to increase/decrease make clean my key F9 or F5? do not work. what keys to use on acer laptop? Thanks
If you are referring to increasing/decreasing the brightness of the screen it is typically:
Press Fn + Left/Right Arrow or Fn + Up/Down Arrow (Depending on the Model)
Check the function keys for the sun/brightness icon.
If the F-keys are not functioning, press **Fn + Esc** (toggles Fn Lock) and then press the brightness key again.
The exact shortcut will depend on the model of your Acer, so if you post your model number (ex: Aspire 5 A515-58M), I can give you the exact shortcut.