Satellite C850-B735 brightness control stop working

Hi,
I am having problem with brightness control.
When I restart or start my laptop, brightness control works fine (fn+f2 to decrease, fn+f3 to increase)
When I sleep laptop and resume laptop, the brightness control stop working and brightness of lcd remains to high bright.
i-e- when pressing fn+f2 or fn+f3, brightness is not decreasing or increasing.
It was working before two days. I didn't install or update any display driver and driver from toshiba download site is installed from the day first. display-20130111074851.zip

Hi Chand
This is user-to-user forum and we can try to help you with useful tips.
You cannot expect that someone collect and send you drivers. How to send you, for instance, display driver with 100 MB capacity.
You must download it alone. I presume you have machine designed for Middle East so visit please Toshiba support page on http://www.toshibamea.com/ choose your destination and check for support. As far as I know Toshiba offers drivers for supported operating systems.
Instructions about Win8.1 upgrade you can read on http://www.toshiba.eu/innovation/generic/windows8_1-message/
By the way: have you upgraded Win8 that you got to Win8.1? Im not 100% sure but I presume you got machine with Win8 64bit version, right?
Have you created recovery media before you have installed Win8.1 version? If not please do this. Recovery media creation is very important.

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I have been having the issue of no brighness control when running windows through bootcamp for about 6 months now and have not found any applicable solution online.
While messing around trying to figure it out yet again I noticed that my monitor driver was signed by team viewer...
Sure enough clicking the roll driver back button resolved the issue by rolling the driver back to the Microsoft driver...
So long story short:
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Rolling this back instantly resolved my issue. I will now propagate this post to all the threads I saw regarding this issue.
I am running windows 7 x64 Ulti on a 15" rMBP.
Best of luck

Satellite C850-B735 brightness control stop working

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