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For windows 8, go to PC Settings > PC and Devices > Power and Sleep > Turn off "Adjust my screen brightness automatically" and you should have your full brightness on


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the below solutions works fine for me.. i am posting it as answer so that others might get help: change the permission: sudo chmod a+rw /sys/class/backlight/intel_backlight/brightness now change brightness: echo 400 > /sys/class/backlight/intel_backlight/brightness in your case it would be: /sys/class/backlight/acpi_video0/brightness


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I have a Dell U2515H connected via HDMI to an nVidia card. I tried softMCCS and it worked fine. I was able to adjust the backlight brightness from the software. These are the control codes this monitors apparently supports: New control value Restore factory defaults Restore luminance/contrast defaults Restore color defaults Luminance Contrast Select color ...


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Under Intel(R) HD Graphics Control Panel, go to Power, under Display Power Saving Technology, choose Disable, Apply Here is what Display Power Saving Technology does: Intel GPU model may include the Display Power Saving Technology feature that can save the computer's power consumption by optimizing picture contrast on the internal LCD.


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I know this is an old question, but I figured I'd put my two cents in. I actually use f.lux, and it's a great piece of software. It supports (though I don't know since when) screen contrast dimming with use of the Alt+PgDn and Alt+PgUp hotkeys (Down for dimmer, up for brighter) and it's an eyesaver.



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