This thread should lead to a solution to this infamous phenomena.
In order to find a fix we need your contribution and feedback.
First we have a really old FAQ'd thread where Pieter offered a solution, which fixed the problem for the 80s drivers using VISTA's built-in SmartDimmer:
;Smart Dimmer Controls HKR,, EnableBrightnessControl, %REG_DWORD%, 1 HKR,, PanelPWMFrequency, %REG_DWORD%, 200 HKR,, PanelBrightnessLimits, %REG_DWORD%, 0x0000FF32
Second i have made some effort and consolidated all threads and posts i found in the Support forum (there are even more in some of our specific driver threads, but i left them alone) and merged them for better overview:
- HP: http://forums.laptop...showtopic=14484
- LENOVO: http://forums.laptop...showtopic=14439
- SAMSUNG: http://forums.laptop...showtopic=14409
- SONY: http://forums.laptop...?showtopic=9070
UPDATE 2008-04-04 At least for SONY users there is a fix available here:
Basically Bogart found out which NVIDIA settings are responsible for proper brightness control in conjunction with the Sony Control Panel and then he added those settings to Pieter's INF.
Good detective work
- TOSHiBA: http://forums.laptop...showtopic=15109
Third if there are more users out there with laptops manufacturers not mentioned above pls. report in here and be as specific as possible.
Fourth in your post make sure you include any relevant information such as:
- Laptop Make/Model
- Graphics Card
- Current working Driver Version
- Last Useable Driver Version
- Operating System
- An accurate description of the issue at hand
- attached NERD log
Including this information can help speed up a response.
Fifth i'm not sure if the brightness problem is only present within VISTA or if it even applies to XP. Also it's not clear to me if FN keys or the VISTA SmartDimmer page are used to control brightness or if they are connected.