F2 and F3 brightness keys not working only not on the DM4-3050US laptop

I have a Pavilion DM4-3050US laptop.  The brightness keys don't work at all.  All the other function keys work fine, like F9 and F10 to volume.  I looked long and seriously and tried almost all of the solutions that I found, which it which seemed so promising: http://h30434.www3.hp.com/t5/Notebook-Display-and-Video/Brightness-Controls-Stopped-Working-dm4/m-p/....  Nothing works, however.  I won't do a factory reset - no need to reinstall all the software for the brightness.  I also called HP and they offered replace the laptop, but still once, does not only apply to worsening brightness keys.  Does anyone have any ideas or suggestions?  It must be some sort of bug that HP is aware, no?

Then work my F2 and F3 keys.   They began to apply when I have connected a Microsoft Comfort Curve keyboard to my laptop.  This prompted Win 7/MS update find software for the keyboard that I downloaded and installed.  After the reboot, I discovered that the F2 and F3 keys now dim and brighten up the screen.  I know that this will not work for others, it seems to be related to the installation of the keyboard software, but he has restored somehow keyboard settings that work even if I'm not using the external keyboard.

Tags: Notebooks

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