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1. #Nvidia egpu drivers optimus how to
2. #Nvidia egpu drivers optimus driver
3. #Nvidia egpu drivers optimus software

The behaviour can be seen in the following example: $ DRI_PRIME=0 glxinfo | grep "OpenGL vendor string" The "regular" GPU, set DRI_PRIME to 0 or omit it. When the application is launched, it will use the second card to do its rendering. If you want to offload an application to a GPU, use DRI_PRIME=1. When this is done, it becomes very easy to select which card should be used. In my case, I would like to use Nouveau for offloading the Intel card: $ xrandr -setprovideroffloadsink nouveau Intel It is then important to tell Prime what card should be used for offloading. Provider 1: id: 0圆6 cap: 0x7, Source Output, Sink Output, Source Offload crtcs: 2 outputs: 5 associated providers: 1 name:nouveau Provider 0: id: 0x8a cap: 0xb, Source Output, Sink Output, Sink Offload crtcs: 2 outputs: 2 associated providers: 1 name:Intel In my case, this gives: $ xrandr -listproviders If everything went well, xrandr -listproviders should list two providers.

#Nvidia egpu drivers optimus driver

If your laptop has a hardware mux, the kernel switcheroo driver may be able to set the wanted GPU at boot.

#Nvidia egpu drivers optimus how to

There should be ways to detect the wirings and whether there is a mux and where, but the documentation is not available to the developers (maybe you can help us figure out how to do this, have any ideas? You can also 'petition' nvidia for releasing these specs: nvidia customer help ? ) Switcheroo - Using one card at a time

There is no standard on how to wire things. In the worst case we would have the Intel GPU hardwired to the internal panel and the Nvidia GPU hardwired to the external output! The best case scenario is a mux, which can select which GPU drivers control which outputs.īasically, you can have any combination of these possibilities. The same goes for external monitor output. It is also possible, that a GPU is hardwired to the internal panel, so the other GPU cannot possibly drive the internal panel. Again, if the hardware mux exists it would be used to select which GPU drives the internal panel, or the external monitor, or possibly both. When it comes to how a specific machine is configured, there are a number of possibilities. Specifically it ensures that relevant data is sent to and processed on the right GPU then the data needed for display is copied to the device that displays the image.

#Nvidia egpu drivers optimus software

Thus Optimus is used to effectively "implement" a software mux. If a hardware mux does not exist, there there is no physical way to perform this GPU switching. However such a mux does not always exist! Ideally this would be done by directly flipping a hardware switch, called a mux ( multiplexer). There are two main problems to solve in order to support optimus under linux:ġ) Currently we do not have a way to a priori know what outputs (displays) are connected to what GPU's.Ģ) The supposed optimus software, should perform the task of switching between the which of the two graphics processors drives your display. This GPU connects to a laptop display, or output port. The graphics system in a laptop has a GPU with some memory, in the case of an IGP, this memory may be a piece of system memory, but otherwise it is usually dedicated memory living on the GPU. It may require that the Nvidia GPU has the PCOPY engine. The precursor to this technology was 'switchable graphics,' in which the user could manually switch between the graphics card. This technology is intended specifically for laptops.

'Optimus technology' is a software solution for automatically switching between an integrated graphics chip or IGP (such as on onboard intel chip) and a more powerful graphics chip.