Hello David, > I had a similar issue with my Dell M4800 until I entered BIOS > configuration (vi F12 key at boot), selected "Video," then disabled > "Switchable Graphics." this option is unfortunately not available in "Video" (only display brightness can be set there in my BIOS). Regards, CarstenReceived on Tue Dec 15 2015 - 13:26:07 UTC
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