Portege Z930 - function key does not

Hi, new to this forum. I have a laptop of z930 - 14 d Portege with 64 bit system with Intel Core i5-3437U processor and Windows 7 Professional. I used an external display until recently. When I stopped using it, I noticed that the function of the display brightness key did not work. When I pressed fn and f6 or f7 key, brightness adjustment has come, but I change the brightness. All the other key fn associated operations were very good. I have seen some forums online for this problem and followed their recommendation around the diplay driver upgrade and added value pack from the United Kingdom takes care of Toshiba Web site. Also click on restart flash cards. Nothing seems to have worked and now the fn itself stopped working for example, nothing happens when I press the fn key and I can't perform any operation using the fn key. Please suggest what could be a solution to this problem. Thank you.

Uninstalled then reinstalled display driver and added value pack and the fn key is back but still can not change the brightness. Please notify.

Tags: Toshiba

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