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Most laptops have special key legends (in blue) on the Function Keys and a few others. One of these keys will have a legend that shows a "bright sun", one that shows a "dim sun" . There is a "FN" key, usually to the left of the spacebar. Press this key and the "bright sun" function key at the same time to increase brightness. Successive presses will increase until max brightness is reached.
Adjust the Brightness in Power settings or Press the little blue "Fn" button next to the left "Ctrl" button. Then while still holding down the blue "Fn" button, tap the left and right arrow keys accordingly to increase/decrease the brightness.
Locate and press the "-" button on the front of your monitor. This opens the Brightness/Contrast menu. Press "+" button to scroll through the menu and press "-" to choose the Brightness control. Press the "+" button to increase brightness and "-" to decrease brightness. The settings will automatically save.
Hold the Fn key down, then press the Right Side Arrow key to increase brightness. (Bottom of keyboard, 5th key from the right)
Granted, that doesn't increase the contrast, it increases the Brightness. Should the brightness not increase to a level that you feel is comfortable, then I suggest you have a Backlight, or Inverter going bad.
yes brightness could be increse go the manual of toshiba...actually ON Battry Mode brightness will decrease because for better consuption of battery for long hour. you can increse brightness in it... chk go to the control panel and then go to battery and power option...then change the setting acoordingly...
You may need to just update your driver.
If thats not it then in control panel you should have a graphic settings somewhere.
Or if you look at your laptop keys hit the fn button and then look for a button at the top.
Thats where my laptop brightness and contrast is.You may have to try a few different keys but don't worry if you press the wrong key you can reverse it by pressing function ( fn ) and same key again.
Its not a problem, its how it was designed. With the power cord in it will be at full power so it will light brighter, When the power cord is out, it will be less bright as its using power from the battery , it will light dimmer to conserve power.