According notebook specification your L855 was delivered with WIN7 64BIT HOME PREMIUM so I don’t understand what have you done exactly. why to install other OS version?
Anyway I just hope you have created recovery DVD before you have deleted original preinstalled OS.
Have you installed right display driver? Check it please in device manager?
Quite simply because I use now a hard disk SSD and have anew installed, so, Win7. I have downloaded all drivers of the Toshiba homepage. Nevertheless, there does not function the brightness.Topical driver is installed! einser
For Satellite L850 the Fn +F2 and Fn+F3 key combination changes the screen brightness.
But I read also that the brightness would not work if you would use non Toshiba display driver. So be sure you have installed the display driver from Toshiba page!
I’m asking myself if you have modified the preinstalled system or changed the Toshiba preconfigured Windows OS?
I read here in the forum about people having the same issue but they installed own Windows system… this might be a problem.
Did the Fn buttons (display brightness) work using Toshiba configured system?
Yes i installed my own windows 7 64-bit ultimate and the display bightness control worked with the Toshiba configured system. The brightness control in my windows version ( windows key+x) also didn´t work. So there is maybe a Problem with the CPU-integrated Graphis-Chip "Processor Graphics Intel® HD Graphics 4000"
I noticed that there are two display driver on your support page:
29/06/12 Display Driver AMD Windows 7 - 64 Bit 8.932.5.3 World Wide
14/05/12 Display Driver Intel Windows 7 - 64 Bit 184.108.40.20639 World Wide
The AMD driver works,but i got an error by installing the intel and in my device manager is only the amd listed .
Just an idea i tried my best to solve the Issue . I did n ´t expect that changing the Toshiba configured system (win7-64bit -->win7-64bit) is an Problem.
The entire quality of the notebook is very, very bad.
I don’t know how you can say that. Fact is that you got your notebook with preinstalled WIN7 64BIT HOME PREMIUM and I’m 100% sure everything worked OK.
It is always problematic to install own OS and have 100% functionality as original preinstalled OS.
Anyway, I’m really wondering why you cannot get it work. Most important thing is right install order.
I don’t know how have you installed it but compare it please with this list:
Windows 7 64bit Win7 Sp1
PatchFiles V1.1 KB981287
Intel Chipset SW Installation Utility 220.127.116.110
Intel Management Engine Interface 18.104.22.1689
Intel Display Driver 22.214.171.12439
AMD Display Driver 8.932.5.3-120120a-132503C-Toshiba
Intel Rapid Storage Technology Driver 126.96.36.1992
Realtek Audio Driver 188.8.131.5259
ATI HDMI Audio Driver 184.108.40.20605
Synaptics Touch Pad Driver 220.127.116.11
Atheros LAN Driver 18.104.22.168
SRS Premium Sound HD 1.12.0300
Realtek Card Reader 6.1.7601.39013
Intel Wireless LAN Driver
Atheros Wireless LAN Driver 22.214.171.1242.1.s3264_wCAT_wINF
Atheros Bluetooth Filter Driver Package v1.0.12
Realtek Bluetooth Filter Driver Package v2.3.9.0206.2012
Bluetooth Stack for Windows by Toshiba v9.00.00T
Bluetooth Monitor v4.08
Intel USB3.0 Driver 126.96.36.199
TOSHIBA Value Added Package 1.6.0021.640203
TOSHIBA Web Camera Application V188.8.131.52