Adjust brightness doesn't work

My 'Adjust Brightness' doesn't work.  I want my display at full brightness when plugged but it just doesn't want to display the change after I do it.  I also tested if I can change the brightness when on battery and no response.

What can be causing this?
rayluvsAsked:
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JohnBusiness Consultant (Owner)Commented:
Does your laptop have another power manager installed? If so, try uninstalling it. My T61p WIndows 7 Pro Thinkpad works fine for brightness. I use the Windows power manager, but have the Lenovo power manger installed also and it is not conflicting. ... Thinkpads_User
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Nenad RajsicCommented:
just to make sure. You are using your function key in combination with your brightness up and down keys?
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rayluvsAuthor Commented:
I have a HP ProBook.  I used the function key-up/down as documented in manual and it doesn;t work.  I go directly to the power option screen and move the "slider" and no effect.
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JohnBusiness Consultant (Owner)Commented:
Since it is Windows 7, it must be fairly new. Have you called HP Support? After all, it seems like a strange problem in that I am fairly sure it is not a Windows 7 problem. ... Thinkpads_User
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Nenad RajsicCommented:
option 1: run hp update tool and see if it gives you any updates.
I am guessing here but when you bought your laptop it had Vista on it with free upgrade to Win 7?

option 2. go to http://welcome.hp.com/country/uk/en/support.html and enter your laptop's model NO and see if there is any new software available (see published dates)
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rayluvsAuthor Commented:
Yes it had Vista, I upgraded Windows 7.
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kentcomputersCommented:
It's a driver issue.  

If you do a windows update, look at the optional upgrades, and install anything hardware related.

You can go to the support page on the manufacturer's website, and go to the driver download page.  Specify that you're running windows 7, and look for the latest chipset driver.
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kentcomputersCommented:
The other driver to possibly update is the graphics card driver.
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rayluvsAuthor Commented:
ok... will do.  I'll go thru the update process and inform you guys.
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Ivano ViolaSystem AdministratorCommented:
I think you need to download and install the Windows 7 version of HP Quick Launch Buttons (if you haven't done this already).

iv
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JohnBusiness Consultant (Owner)Commented:
My own Thinkpad came with Vista Business 64-bit, and when I installed Windows 7 Pro 64-bit (retail copy), I had to replace *all* the drivers with Windows 7 drivers from Lenovo. So do make sure you get *every* driver there is (some of my drivers are inter-dependent). ... Thinkpads_User
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