Really low FPS when using video-hybrid-intel-nvidia-prime

Hello, I’m currently using video-hybrid-nvidia-prime as my graphics driver on a dual GPU (intel integrates and nvidia dedicated) laptop.I have a main laptop display and an external display.

The problem I run into is that when I use this driver and connect the external display, everything is extremely slow. I can visibly see frames moving across the screen, and I can tell the FPS is really low. However, when I remove this driver and instead use the video-nvidia driver, I can no longer use the built-in display, but the framerate issue seems to be resolved.

I would like to ideally use both displays with normal framerate. What should I do?

With video-hybrid-nvidia-prime, how do you execute your app? It defaults to Intel, if you want to use the Nvidia card, you have to explicitly run it under prime-run, like this:

$ prime-run glxinfo | grep -i vendor
server glx vendor string: NVIDIA Corporation
client glx vendor string: NVIDIA Corporation
OpenGL vendor string: NVIDIA Corporation
$ glxinfo | grep -i vendor
server glx vendor string: SGI
client glx vendor string: Mesa Project and SGI
    Vendor: Intel (0x8086)
OpenGL vendor string: Intel

As you can see, with prime-run, the vendor string is “NVIDIA Corporation”. But without, it’s “Intel”.

video-nvidia OTOH kills (=not used, not really kill) your iGPU, so your system totally runs on Nvidia card. It could explain the issue why your built-in display then cannot be used as normally it connects to the iGPU, although a little tweak with arandr / xrandr may allow it to use the dGPU.

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I don’t think that solved the issue. Could you link some documentation on how to enable the xrandr tweak for using dedicated graphics only on both external and internal monitors? I should uninstall hybrid and install video-nvidia if I want to do that right?

Recently I explained the issue and the fix,see my post




AND RAN optimus-manager --switch nvidia

Now both of my monitors are at full FPS and I can use both of them!! Thanks so much

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