I can't change laptop screen brightness - Intel GM45, Windows XP

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I can't change laptop screen brightness - Intel GM45, Windows XP

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I can't change laptop screen brightness in any way - by buttons Fn+F7/F8 or through the driver.

Other Fn buttons (ex. Fn+F3 => WWW) work correctly (HP Quick Launch Buttons installed successfully).

This trouble is observed only in Windows XP. In Windows 7 the buttons Fn+F7/F8 change brightness.

All other drivers were installed correctly.

I think it is problem of Intel Graphics Driver for Windows XP.

System info:

- HP Pavilion dv6-1354us

- Windows XP Professional Service Pack 3(5.1.2600)

- Graphics driver: http://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&ProdId=2991&DwnldID=18924&lang=eng Mobile Intel® GM45 Express Chipset

- Graphics driver Version: 6.14.10.5248

- Accelerator in Use: Mobile Intel(R) 4 Series Express Chipset Family

- Video BIOS: 1706.0

- Current Graphics Mode: 1366 by 768

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