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Dead (nearly blank) laptop screen, secondary screen works - how to fix?

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http://askubuntu.com – My laptop screen is black while my secondary screen is fine. * What I tried: - setting brightness (Fn keys) - no effect, no change seen, also on secondary screen - removing static electricity like suggested here - no effect - restarting / charging battery, running on battery / "wall" power What I will try next: wait to see if warming it up helps as well as follow that SU question linked above check last updates I've made follow official Ubuntu diagnostics IIRC I am running on nomodeset already, but can't recall how to verify this Further symptoms: * can't see BIOS screen * s (HowTos)