When waking computer from a sleep state, as I do often, the brightness can't be changed via the keyboard buttons. The slider will slide up and down but nothing changes. Same also happens when I go into control panel. Only thing that will let me change the brightness is resetting the whole laptop. Not what I'd expect from a £1400 laptop. Any known easy fixes??
Update the BIOS and the video drivers. This is usually related to the video driver.
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