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  5. Multi Gpu

Multi Gpu

Table of contents

General

If your host machine uses multiple GPUs, you may want to primarily use one GPU for rendering all the elements for Hyprland including windows, animations, and another for hardware acceleration for certain applications, etc.

This setup is very common in the likes of gaming laptops, GPU-passthrough (without VFIO) capable hosts, and if you have multiple GPUs in general.

Detecting GPUs

For this case, the writer is taking the example of their laptop.

Upon running lspci | grep -E 'VGA|3D', One can list all the video devices available.

01:00.0 VGA compatible controller: NVIDIA Corporation TU117M [GeForce GTX 1650 Mobile / Max-Q] (rev a1)
06:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Cezanne [Radeon Vega Series / Radeon Vega Mobile Series] (rev c6)

Here it is clear that 2 GPUs are available, the dedicated NVIDIA GTX 1650 Mobile / Max-Q and the integrated AMD Cezanne Radeon Vega Series GPU.

Now, run ls -l /dev/dri/by-path

 total 0
lrwxrwxrwx 1 root root  8 Jul 14 15:45 pci-0000:01:00.0-card -> ../card0
lrwxrwxrwx 1 root root 13 Jul 14 15:45 pci-0000:01:00.0-render -> ../renderD128
lrwxrwxrwx 1 root root  8 Jul 14 15:45 pci-0000:06:00.0-card -> ../card1
lrwxrwxrwx 1 root root 13 Jul 14 15:45 pci-0000:06:00.0-render -> ../renderD129

So from the above outputs, we can match the bus IDs and determine that NVIDIA is card0 and AMD is card1.

Telling Hyprland which GPU to use

After determining which “card” belongs to which GPU, we now have to tell Hyprland the GPU we want to use primarily.

It is generally a good idea for laptops to use the integrated GPU as the primary renderer as this preserves battery life and is practically indistinguishable from using the dedicated GPU on modern systems in most cases. Hyprland can be run on integrated GPUs just fine. The same principle applies for desktop setups with a lower and higher power rating GPUs respectively.

We can do so by using the WLR_DRM_DEVICES variable.

Add the following template to hyprland.conf

env = WLR_DRM_DEVICES,/dev/dri/cardN

For our case, we want to use card1 primarily and use it to render stuff.

env = WLR_DRM_DEVICES,/dev/dri/card1:/dev/dri/card0

Here, we tell Hyprland to set priorities. If card1 isn’t available for whatever reason, use card0. So if the AMD GPU isn’t available, use NVIDIA. The colon is for setting priorities, essentially.

You should now be able to use an integrated GPU for for lighter GPU loads, including Hyprland.