My laptop, Acer Aspire 5740, running Ubuntu 16.04 and Windows 10 as dual boot. On Windows I can change the display brightness so that it changes instantly, but when I boot into Ubuntu and change the display brightness, it doesn't change the brightness until I reboot. What may be the reason for this? How to fix it?
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Have you resolved the issue @Nuwan ? – Liso Dec 15 '16 at 09:21
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Possible kernel compatibility problem. Have you tried [this](http://askubuntu.com/questions/594068/fnf5-f6-keys-to-adjust-brightness-doesnt-work)? – lamino Dec 15 '16 at 11:31
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@lamino No I didn't. Thanks for the link. I can use Fn+ dedicated keys to adjust brightness, it show the brightness bar increasing and decreasing, but the adjustment take into effect after a reboot. – Nuwan Thisara Dec 15 '16 at 11:44
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try this to increase and decrease screen brightness
xrandr --current # to get the name of the your laptop's active display
xrandr --output LVDS1 --brightness 1.0 # change from 0.0 to 1.0
Adel Kihal
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No, you can use custom keyboard shortcuts to assign different commands as shown below https://s29.postimg.org/3l3g310g7/Screenshot_from_2016_12_21_10_23_21.png – Adel Kihal Dec 21 '16 at 09:27