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Go to your battery icon at the right bottom corner of your pc. Click on it, then select "more power options". When you have done that, you would see the power mode which you are on highlighted. Select "change plan settings". When you have done that, you would see the setting for the pc wile plugged in, and while on battery. For the "adjust brightness", increase the brightness of the pc while on battery. Then save the changes. I hope this does help. Please do let me know by rating the answer. Hane a nice day.
If you right hand mouse click on your desktop picture, a menu will become available. Click on Screen resolution and then Advanced settings. There will be options inside that window to allow you adjustment of the display. Hope that helps.
What on bios is just what you answer yes or no but probably if there is any terminology been used that only where you might be confused but on bios is not compulsory for you to pass through bios you can leave the system and never press the Functional key been ask to press to move to bios settings and if you are tarckle the dates and time then move your arrow keys to the advanced settings from there click on the date is already shown like this 00:00:00 or better still with some kind of old date then on each of the 00: click on your keyboard the - (minus) and + (plus) on the keyboard to adjust the date to the current one ok and then press F10 to save and exit.
This is possibly, a loose cable or the screens inverter board is overheating. the inverter is similar to a booster in a flourescant light fitting. which converts power from DC To AC and boosts up the panels Light Tube. CFL if it,s faulty or overheating. this will cause the panel to dim.
also check the plunger at the underside of the screen, isn,t sticking down. designed to cut off the panel when the lid is closed. Finally some model laptops, only boost the brightness running on A/C Power. the battery would run-out fast with screen at full brightness. if theres an fn key on the keyboard, press fn and the brightness button to adjust screen brightness.