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I recently attempted to clean out my fan, which requires removing the keyboard of my Lenovo P500 laptop to get to. Under the keyboard there are two sets of wires that connect it to the laptop: one which I assume is for all the keys since it is much wider and the other which I believe powers the keyboard's backlight. I accidentally disconnected the one which I believe powers the backlight and eventually got it back on but now when I boot my computer the backlight turns on, but the original Fn + Space keystroke to toggle the light on/off doesn't do anything so the backlight is stuck on.

I typically run linux (LMDE), but today I re-installed Windows 8.1 to see if upgrading the driver for bios or anything else solved the problem, but to no prevail.

Although getting the Fn combonation back would be ideal, I'd be just as happy if there was some script I could run (In windows or linux) to toggle the backlight.

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It sounds to me like there is physical damage. If you boot into Windows and use the on-screen display for backlight, do you see it reacting to your changes as you toggle it on and off with Fn+Space? I suspect that some of the insulation was scraped off, and is grounding out against the bottom of the keyboard or something, bypassing the switching off and on of the backlight. Why it would be switched on ground vs + I don't know, but that's a guess. – Brad Feb 10 '14 at 0:21
@Brad what do you mean by the on-screen display for backlight? – Brian Feb 10 '14 at 0:27
My T430s and T440p both have a little backlight icon that pops up for a bit when I turn on the backlight. I doubt it's available in Linux, but since you've reinstalled Windows recently, it's an optional download from Lenovo. It's probably available for your machine. – Brad Feb 10 '14 at 0:32
@Brad nothing, although I don't remember there being such a thing when I first had windows installed and the backlight worked. This is probably a bit far-fetched to ask over the internet but do you think replacing the keyboard with a new one would fix the problem? I can get one for much cheaper than I imagine having it repaired would cost me. – Brian Feb 10 '14 at 0:35
Yeah, if the problem isn't obvious, it's possible replacing it would fix the problem. That assumes the problem though is with your function key and space bar. Does each key work independently? If so, that probably isn't the issue. Check for damage on that cable first. – Brad Feb 10 '14 at 0:39

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