Satellite L855-124 can't change display brightness after Win 8 upgrade

Hello everyone,
I have a problem with my Toshiba Satellite L855-124 PSKACE laptop.
After upgrading to Windows 8, I can't change the brightness backlight of the laptop screen.
There seems to be an error in the graphical driver.
When I install the Windows 7 graphical AMD driver under compatibility, it works again but bugs out on other areas.
Anyone have any ideas?
Even after using the upgrade assistant provided by Toshiba it does nothing.
Also the drivers for my laptop are poorly updated. Dating back to 2012.
I have also called tech support, they told me that a driver team will be fixing the issue.
That was 2 months ago.
Is there anyone from Toshiba that can help me with this please?
Thank you.

The document provides info about the notebook models:
Satellite L870, Satellite L875, Satellite C870, Satellite C875, Satellite Pro C870, Satellite Pro L870, Satellite C850, Satellite C855, Satellite L850, Satellite Pro L850, Satellite Pro C850
PSKBLE, PSC8EE, PSC8FE, PSKBME, PSKCCE, PSKCEE, PSKDLE, PSKDME, PSKDNE, PSKCDE, PSKCCR, PSC8ER, PSKCCF, PSKCCV, PSKCEV, PSKBLR, PSKDLV, PSKDLR, PSKDLF, PSKG9E, PSCBBE, PSKFPE, PSCBZE, PSCBYE, PSKG8E, PSKFNE, PSCBDE, PSCBYR, PSKFNR, PSKCER, PSCBCR, PSKG8R, PSKFLE, PSCBCE, PSKG8V, PSCBYV, PSCBYF, PSKG8F
Choose the driver released for the following models

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