I used to be able to color calilb the built-in and external monitor of my Lenovo G500 64-bit Win8.1 laptop. Then suddenly Color Calibration of Win has error when I tried to calib the external monitor. It seems that the Color Management of Win can not see the external monitor under "Device".
So I updated the Intel HD graphic 4000 driver with no effect. Then I uninstalled the video card driver and re-install from scratch. Now Color Management see no monitor at all! :(
I wonder if there is some additional step need to run to "notify" Win 8.1 after the re-install. I find similar issue in this thread: Windows 7 losing one of my displays after restart
I also found out that I cannot adjust the brightness (either under Power Option or using the hotkey) after this re-install.
But it was beyond me to learn any useful hints.
I really don't want to re-install windows. Any help will be greatly appreciated!