Comment 108 for bug 1169376

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Bib (bybeu) wrote : Re: XPS13 backlight stopped working after update 3.8.0-18.28

I can confirm that FHD lcd backlight controls F4/F5 works from BIOS to grub included, and broken once ubuntu is loaded.
In the same time, keyboard backlight control F6 works only once ubuntu is loaded (not from BIOS to grub included).