How to reduce screen brightness below standard level

Hi !
How to reduce screen brightness below standard level in ThinkPad T520 ?
I think it is possible somehow, but I don't know how. I reduced brightness to zero using Fn key + End key, but it's not enough, I want to make screen darker, because my eyes get tired.
Solved!
Go to Solution.

The latest Intel graphics driver (from Lenovo) is here:
http://support.lenovo.com/us/en/downloads/migr-770​38
This should provide a decent lower bound to brightness. If the install complains about unsupported hardware, force the install using Device Manager and Have Disk. (Something like this: http://forums.laptopvideo2go.com/topic/11997-have-​disk-method-for-windows-7-vista/ )
If that didn't work, try f.lux (https://justgetflux.com/). It has a software dimming feature (of course, this loses contrast).
W520: i7-2720QM, Q2000M at 1080/688/1376, 21GB RAM, 500GB + 750GB HDD, FHD screen
X61T: L7500, 3GB RAM, 500GB HDD, XGA screen, Ultrabase
Y3P: 5Y70, 8GB RAM, 256GB SSD, QHD+ screen

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