Problem with Nvidia GeForce 840M

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pewe

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Oct 23, 2014
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4,510
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I have an HP I7 laptop with a Nvidia GeForce 840M video card.

The last time I used it for video processing it had Windows 8.1 installed and the video editor used the Cuda features of the card.

Today I needed to edit a video file and noticed that the program states that Cuda cannot be enabled, so I checked and found the graphics processor now being used is an Intel HD Graphics 4600 which I assume is the integrated system on the motherboard.

I suspect that this change has come about because I upgraded to Windows 10 last year, and recently Windows 10 updates reported an error installing the latest Nvidia driver - a problem which seems to have been rectified - or has it.

Has anyone any idea how I can get the system to use the Nvidia card again.

Thanks
 

pewe

Estimable
Oct 23, 2014
8
0
4,510
0


HP don't have any drivers more recent than beginning of last year - but I have used the Nvidia update program to keep the 840M drivers up to date (and ignored the Windows Update).
 

Wolfshadw

Splendid
Moderator
Just understand that HP may have tweaked the standard NVidia drivers to limit power and thermal thresholds. Using standard NVidia drivers may have damaged your system/graphics card.

If Windows 10 installed drivers, then you may want to try removing that update and see if you can get the drivers from NVidia working again.

-Wolf sends
 

pewe

Estimable
Oct 23, 2014
8
0
4,510
0


I've tried removing and re-installing the driver a few times.

The card appears and is 'working normally' in Device Manager and if I go in to the Nvidia control panel I can set the driver in the 3D section and it recognizes the Cuda ability of the installed 840M and I can set that card as default for the video editor programs.

However, the video editors still report that the card does not have Cuda capability.


 

pewe

Estimable
Oct 23, 2014
8
0
4,510
0


Ok - thanks anyway



But I have found the correct driver - at least according to Nvidia.
They supply an update program which checks for driver updates for any Nvidia card and OS it finds on the system.

So I guess it's a compatibility issue. :??:
 

pewe

Estimable
Oct 23, 2014
8
0
4,510
0


This is what I get if I do that and then try to open the Nvidia Control Panel


 

pewe

Estimable
Oct 23, 2014
8
0
4,510
0


Unfortunately I have done all of this already.
I have even uninstalled the latest Nvidia driver installed by Windows Update, and re-installed the older version for my setup from HP's web site - and still no luck.

GPU-Z reports both the Intel HD and the 840M are installed, and that the 840M has Cuda capability.
However all the video editors report that the Graphics card being used has no Cuda Capability.

So it seems that Windows 10 appears to have locked the laptop screen to use the Intel graphics - ignoring what I have set in the Nvidia control panel.
 
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