Blank screen issue with 3.10.3 kernel and zenbook UX21A, intel video

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https://bbs.archlinux.org – I have the same problem with laptop ASUS Zenbook ux32vd. I deleted all nvidia drivers, bumblebee, bbswitch to eliminate conflicts between drivers. Only driver xf86-video-intel left. But the problem persists. It displays images only on external HDMI display. The embedded laptop screen is black. Driver recognizes internal laptop screen showing its resolution and it is possible to move windows on that screen but it remains black. I don't know what to do. Is it possible that driver wrongly reads some EFI variables and therefore cannon switch on the screen? ZeroLinux https://bbs.archl (HowTos)