Problem with Nvidia GeForce 840M

pewe · Jan 16, 2017

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

Wolfshadw · Jan 16, 2017

See if HP has Windows 10 drivers for your laptop.

-Wolf sends

pewe · Jan 16, 2017

Wolfshadw :

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 · Jan 16, 2017

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 · Jan 16, 2017

Wolfshadw :

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.

Wolfshadw · Jan 16, 2017

Sorry man, but I've got nothing else.

-Wolf sends

pewe · Jan 17, 2017

Wolfshadw :

Ok - thanks anyway

xjxjxj01 :

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 · Jan 17, 2017

xjxjxj01 :

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

pewe · Jan 19, 2017

xjxjxj01 :

pewe :

And the report states, what the message says: You monitor is attached to the onboard Intel graphics at the moment. Attach it to the Nvidia card and the message will be gone.
Solution:
1. Open Device Manager > Under Display adapters > you should see Intel HD Graphics and NVIDIA.

2. Right-click the blank space of the desktop. Select NVIDIA Control Panel to switch between two graphics manually under Manage 3D Settings > Preferred Graphics Processor.

This should allow users to run the system on the Nvidia GPU whenever required.

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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Problem with Nvidia GeForce 840M

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