Cheers PS: I did install the new chipset and bios updates for my T400 prior to tweaking. If you have similar problems with the brightness then try tweaking the plan settings in power options and hopefully this will work for you as well. Just for the fun of it I went back to power options and click on the "change plan settings" for power saver, went in and altered the plugged in settings (adjust plan brightness etc) and low and behold, when i exited the brightness slide appeared at the bottom of the screen as described by Microsoft. Tried the advise with bios modification described by Phil's technical musings ( Link Removed - Invalid URL) but in vain. In addition my hotkeys for brightness control sort of black out as well. According to Microsoft then the brightness should be controllable under the Power option panel (sliding bar) but this was not visual when I tried it out the first time. Had exactly the same brightness (or lack) as discussed above. Have a t400 and just installed windows 7. Drag the brightness slider to adjust the screen brightness. (If the slider isnt there, see the Notes section below. If you’re considering upgrading your monitor or switching to a 2-monitor setup, check out our guide on how to choose a monitor. Select the Network icon on the right side of the taskbar, and then move the Brightness slider to adjust the brightness. I hope that resolves the issue Edit #2: Finally, it worked, I installed the drivers for the nVidia GeForce 8400M and also the latest Chipset drivers from Intel 900 series. Click the message icon to the right of the clock in the taskbar to open the action center. I'm still looking for a solution :S Edit: I'm going to download the chipset drivers from the Intel website and also the win7 nVidia drivers for the GeForce 8400M. Choose to turn on or turn off this feature for both when it’s on battery power and when the computer is plugged in. The brightness control worked when I had Vista installed. Expand it to show the Adaptive Brightness option. My BIOS doesn't allow me to change any settings regarding brightness, I can't find it anywhere! In the Boot tab of the BIOS I only get a list of: Hard Disk, CD Rom, USB and some other devices, but nothing related to brightness, thus, this solution doesn't work for me, screen is about 75% bright, its bearable, but not for my taste, and I can't dim it all the way down using Power Saver plan or put it all the way up in High performance plan because the control won't show on Power Plan settings (not even in advanced power settings). it will show the little progress bar but the brightness itself doesn't change. I managed to install Dell's Quickset app, all keyboard functions work now, except the brightness. I'm using a Dell Vostro 2510, and just installed Windows 7 Ultimate.
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