UPDATE : The new drivers have fixed the issue. Please see this post for more Informaiton
Have an Nvidia Graphics driver and cannot change your brightness? I also had the same problem after upgrading my Lenovo G460 to Windows 8 Pro. I contacted Nvidia and they have given me the solution. Here are the steps to follow to enable your brightness setting:
1) Download the latest 314.21 beta driver (haven't tested this on the current driver) here: http://www.geforce.com/drivers/results/59436 and perform a clean install.
2) check if "Enable adaptive brightness" option is enabled and if yes try turning it off to see if that will help. This option is located under the Windows 8 power options. You can access it via the Windows control panel > Power Options > Change plan settings (which ever plan is active) > Change advanced power settings > Display > Enable Adaptive Brightness.
3) Check if you are able to change your brightness.
3) If the "Enable adaptive brightness" option does not impact issue then try following the steps below to add a registry and see if that helps.
4) How to add registry key:
1. Make sure you are running the 314.21 driver.
2. Download the "DispRegEdit.exe" tool from http://goo.gl/f0wUt to your local system. This tool will take you directly to the registry location where all the graphics drivers registry entries are stored.
3. Run the "DispRegEdit.exe" tool. It should bring up the registry editor and take you directly to the location where all the NVIDIA driver settings are store.
4. Create a new key by right-clicking on the right-hand pan of the registry editor window and then select "New" > "DWORD (32-bit) Value".
5. Label the name of the new key as "RMBrightnessControlFlags".
6. Once key has been created, double click the new key and then add the "0x800" to Value data area. Click OK to save.
7. Restart Windows.
8. Check brightness control again
5) This solution is for selected laptop models. If this did not work for you, here's an extract from my Personal Assistance question -
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That should be fine but it may be best if the other users impacted by this problem submit a bug to NVIDIA. Again the registry key will be targeted for specific laptop models only so unless we know which laptop model is impacted it will not be added to our future drivers. Adding this registry key is more a temporary workaround until we can get this fixed in a future driver. Have other users submit a bug to the link below with "[For Ray]" in the subject so I can pick those up. Have user include the following information in the bug submission.
1. Brand/model of the laptop.
2. Run dxdiag.exe and save log. Upload the log with the submission.
http://nvidia-submit.custhelp.com/cgi-bin/nvidia_submit.cfg/php/enduser/std_alp.php
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Have an Nvidia Graphics driver and cannot change your brightness? I also had the same problem after upgrading my Lenovo G460 to Windows 8 Pro. I contacted Nvidia and they have given me the solution. Here are the steps to follow to enable your brightness setting:
1) Download the latest 314.21 beta driver (haven't tested this on the current driver) here: http://www.geforce.com/drivers/results/59436 and perform a clean install.
2) check if "Enable adaptive brightness" option is enabled and if yes try turning it off to see if that will help. This option is located under the Windows 8 power options. You can access it via the Windows control panel > Power Options > Change plan settings (which ever plan is active) > Change advanced power settings > Display > Enable Adaptive Brightness.
3) Check if you are able to change your brightness.
3) If the "Enable adaptive brightness" option does not impact issue then try following the steps below to add a registry and see if that helps.
4) How to add registry key:
1. Make sure you are running the 314.21 driver.
2. Download the "DispRegEdit.exe" tool from http://goo.gl/f0wUt to your local system. This tool will take you directly to the registry location where all the graphics drivers registry entries are stored.
3. Run the "DispRegEdit.exe" tool. It should bring up the registry editor and take you directly to the location where all the NVIDIA driver settings are store.
4. Create a new key by right-clicking on the right-hand pan of the registry editor window and then select "New" > "DWORD (32-bit) Value".
5. Label the name of the new key as "RMBrightnessControlFlags".
6. Once key has been created, double click the new key and then add the "0x800" to Value data area. Click OK to save.
7. Restart Windows.
8. Check brightness control again
5) This solution is for selected laptop models. If this did not work for you, here's an extract from my Personal Assistance question -
--------------------------------------------------------------------------------------------------------------------------
That should be fine but it may be best if the other users impacted by this problem submit a bug to NVIDIA. Again the registry key will be targeted for specific laptop models only so unless we know which laptop model is impacted it will not be added to our future drivers. Adding this registry key is more a temporary workaround until we can get this fixed in a future driver. Have other users submit a bug to the link below with "[For Ray]" in the subject so I can pick those up. Have user include the following information in the bug submission.
1. Brand/model of the laptop.
2. Run dxdiag.exe and save log. Upload the log with the submission.
http://nvidia-submit.custhelp.com/cgi-bin/nvidia_submit.cfg/php/enduser/std_alp.php
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6) My friend Ray will help you with your brightness problems or any other problems with your display drivers. Mine took a lot of time to be solved but don't worry, we now know the right solution for mostly all systems having an Nvidia graphics card.
