[Q] Soft key lights stay on permanently

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http://forum.xda-developers.com – Hello there, first post on here. Anyone have/had a similar problem to this? The three soft key lights on my Optimus 4X now stay illuminated permanently. Even when the phone is switched off, they remain lit. I went so far as to completely drain the battery (or so I thought) so that there was insufficient power to turn the device on but the lights are still on. Does anyone know of any fix for this? Obviously, having these lights on all the time drains my battery quicker. I've tried the options in settings to switch it off and nothing works. I can only assume that this is a hardware fault. (HowTos)