Please note the “fn” key is working fine if I want to change the keyboard backlight by pressing “fn” and the right arrow. Step 2: Use the slider under Brightness to adjust the screen. If you have tried above things and the brightness is still not working, you may need to contact Dell support for further assistance. Step 1: Press the Windows key + I keyboard shortcut to launch the Settings app. When I press Fn + F11/12 it shows the box with the level changing, but the screen itself does not change at all. Hello, Ive just bought a new (4k led touch display)and out of the box I can not adjust the brightness level of my screen. To do this, hold down the power button for about 10 seconds until the laptop turns off. XPS 15 7590, Brightness control does not work. The problem is when I press the “fn” key with one of those keys, nothing happens but I can see the screen very slightly flashing but there is no light increased or decreased. Reset the lapIf it fails, you can try resetting the laptop. The keys associated for the screen brightness are the “Fn” and the top arrow to increase the brightness and the down arrow to decrease. # cp /usr/local/share/examples/intel-backlight/nf \ # echo 'acpi_video_load="YES"' > /boot/nf the backlight connected to the Intel video chipset):Īnd in particular to be able to control it via the function keys (Fn+Up, Fn+Down) which Dell exposes via ACPI: “I want to be able to control the brightness of the screen (aka. I was working fine using windows 8.1 native control. when windows 8.1 came up, I was always checking brightness. I created system image of what I already had rebuilt in windows 8.1, and did full clean re-install. I followed the instructions in this post where the author said: I started doubting my install process, if I missed anything. I installed and I can change the screen brightness by entering ,for.e.g, “intel_backlight=40”. My goal is to get the “fn” working to change the screen brightness. When using this setting, the Ambient Light Sensor has to be set to Enable in the BIOS.My laptop is a dell latitude 7240 with a Haswell cpu. Other than that I can only think that it is a possible missing driver, I checked and didn’t find any Windows 10 drivers listed.
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