Tony The Tiger
I have a Hewlett Packard Pavilion DV7 laptop with Windows 7. I have been having problems with the screen brightness. The operating system's control panel has both a Power options control and an NVIDIA control panel for the video card. I have the default recommended Hewlett Packard power plan options chosen in the power options control. This should cause the screen to dim when the computer is unplugged from an external power source and to brighten again when I reinsert the power cable. Oddly it stopped dimming when I unplugged it. When I tried to check the configuration of the power saving battery power options by changing them the brightness was unaffected. I called tech support and we were able to control the brightness by going into the NVIDIA control panel. It seems odd that we had to control the brightniess from the video card controls instead of the regular operating system power controls. Then this morning when I woke up and attempted to undo the dimming that I had set the computer ignored these commands. I had to uninstall and reinstall the video card drivers in order to reset the brightness controls, which now seem to be working fine. All this is odd to me though.