77 lines
2.5 KiB
Markdown
77 lines
2.5 KiB
Markdown
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# Table of contents
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{{< toc >}}
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# General
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If your host machine uses multiple GPUs, you may want to primarily use one GPU
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for rendering all the elements for Hyprland including windows, animations, and
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another for hardware acceleration for certain applications, etc.
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This setup is very common in the likes of gaming laptops,
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GPU-passthrough (without VFIO) capable hosts, and if you have multiple GPUs in
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general.
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# Detecting GPUs
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For this case, the writer is taking the example of their laptop.
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Upon running `lspci | grep -E 'VGA|3D'`, One can list all the video devices
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available.
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```
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01:00.0 VGA compatible controller: NVIDIA Corporation TU117M [GeForce GTX 1650 Mobile / Max-Q] (rev a1)
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06:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Cezanne [Radeon Vega Series / Radeon Vega Mobile Series] (rev c6)
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```
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Here it is clear that 2 GPUs are available, the dedicated NVIDIA GTX 1650 Mobile
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/ Max-Q and the integrated AMD Cezanne Radeon Vega Series GPU.
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Now, run `ls -l /dev/dri/by-path`
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```
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total 0
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lrwxrwxrwx 1 root root 8 Jul 14 15:45 pci-0000:01:00.0-card -> ../card0
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lrwxrwxrwx 1 root root 13 Jul 14 15:45 pci-0000:01:00.0-render -> ../renderD128
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lrwxrwxrwx 1 root root 8 Jul 14 15:45 pci-0000:06:00.0-card -> ../card1
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lrwxrwxrwx 1 root root 13 Jul 14 15:45 pci-0000:06:00.0-render -> ../renderD129
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```
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So from the above outputs, we can match the bus IDs and determine that NVIDIA is
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`card0` and AMD is `card1`.
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# Telling Hyprland which GPU to use
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After determining which "card" belongs to which GPU, we now have to tell
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Hyprland the GPU we want to use primarily.
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{{< hint type=info >}}
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It is generally a good idea for laptops to use the integrated GPU as the primary
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renderer as this preserves battery life and is practically indistinguishable
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from using the dedicated GPU on modern systems in most cases. Hyprland can be
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run on integrated GPUs just fine. The same principle applies for desktop setups
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with a lower and higher power rating GPUs respectively.
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{{< /hint >}}
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We can do so by using the `WLR_DRM_DEVICES` variable.
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Add the following template to `hyprland.conf`
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```ini
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env = WLR_DRM_DEVICES,/dev/dri/cardN
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```
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For our case, we want to use `card1` primarily and use it to render stuff.
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```ini
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env = WLR_DRM_DEVICES,/dev/dri/card1:/dev/dri/card0
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```
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Here, we tell Hyprland to set priorities. If `card1` isn't available for
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whatever reason, use `card0`. So if the AMD GPU isn't available, use NVIDIA. The
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colon is for setting priorities, essentially.
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You should now be able to use an integrated GPU for for lighter GPU loads,
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including Hyprland.
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