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you can change that in power settings right click on the battery bottom right of the screen hit change power settings u will get options u want to change power settings look at the options you want to make it stay brite all the time right now you have it set to be brite only when plug is in change the option when its unplugged to brite also
If you plug the charger into the computer without the battery and the laptop runs fine, then I would suggest to you that your battery is failing and will no longer accept the charge. On the other hand if the laptop will not stay running or acts strage and the screen dims and gets bright, then I would suggest to you that the charger's built in voltage regulator is failing and will damage the laptop if it continued to be used. A bad charger will also permenently destroy the battery condition.
First thing is to test the battery and this is how Turn on head lights, if dull leave on to see how long the stay on for. Next turn lights off put battery on charge for 6 hrs .Turn on lights again if still dull either battery or charger no good
If lights bright try to start and when starter trys to turn engine over the lights go dim THEN battery is no good.
Then get a jump start from another battery and put pos term on both batterys first, then earth lead(BLACK) on last then start if starts ok remove the BLACK lead and turn on head lights if goes bright ALTERNATORs ok so replace battery ....