Incorrect monitor information and size in Yosemite

https://pp.userapi.com/c844721/v844721850/54823/pbIe0X8kp9o.jpg

GPU 8400GS(HDMI, VGA, DVI)

I have a monitor, that connected via VGA—>VGA (because I haven't got digital ports).

But my monitor is detected as "Monitor monitor" and screen size (not resolution) is wrong. I have two black borders on my screen on two sides. I clicked on my monitor AUTO/SET button, then left black side was hidded.

How to fix this wrong information about my monitor? Maybe via editing some config files?

p.s. don't ask me to buy new monitor or converter to digital port!

p.s. this trouble is only on monitor, hdmi connection on TV is working perfectly

Thanks :)

Author: @twikoffin