The display brightness can be changed using the key combination FN + F6 (increase) and FN + F7 (decrease).
Did you read the user manual? This is mentioned in the manual preinstalled on the notebook.
Furthermore you should also check the Win 7 Power Options.
You can find this in control panel -> power options.
I assume the notebook switches to another battery optimized power plant while you disconnect the AC adaptor. In such case the display brightness goes down to ensure longer battery working time. You can change the brightness level for this power plant too.
I would add brightness to the maximum. in all settings, power is at maximum. but all the same battery included with the backlight. becomes even brighter. turn led lights. Eran is the brightness of the led lights separately and individually. they do not work together. the brightness of the screen is an option. led lights and a separate lamp. it burns the same brightness, and does not change it either turned on or not. My interpretation is included in the charge
yes work, but added brightness, led lights will not turn on. at full brightness of the image bright but not clear If not connected to the charging. after that, the backlight turn on and the image becomes clear lights.
Do you have a laptop c660d ?
However, is your BIOS up to date? Check this and update the BIOS.
You can also try to remove the battery and Ac adaptor and leave the notebook disconnected for some hours.
Then connected both parts again…
To be honest I’m not quite sure about your issue… its not really clear to me…
In worst case it could be a hardware problem with the display which should be checked by an ASP.