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thebigdill97
n00b
Joined: 20 Apr 2022
Posts: 13
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 Posted: Fri Oct 28, 2022 10:25 pm Post subject: How do I force applications to use AMD GPU over NVIDIA? |
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I have two dedicated GPUs in a desktop with no iGPU. One is NVIDIA and one is AMD. I would like to use the AMD card for everything while still having the option of loading the proprietary NVIDIA driver to use for CUDA, or possibly pass through to a VM in the future.
I am currently running sway/wayland as my window manager. I have all required kernel options configured for both GPUs, and have the NVIDIA drivers installed. Kernel version linux-6.0-pf3 (pf-sources). Only the AMD GPU has any displays plugged into it.
When I boot the system (before launching sway) the nvidia kernel module is not loaded. After launching sway, the nvidia kernel module is loaded, despite both being blacklisted and not supported by wayland.
running lsof /dev/nvidia0 gives the output:
| Code: |
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
sway 9432 user 13u CHR 195,0 0t0 1685 /dev/nvidia0
sway 9432 user 14u CHR 195,0 0t0 1685 /dev/nvidia0
Xwayland 9571 user 9u CHR 195,0 0t0 1685 /dev/nvidia0
Xwayland 9571 user 10u CHR 195,0 0t0 1685 /dev/nvidia0
kitty 9657 user 11u CHR 195,0 0t0 1685 /dev/nvidia0
...
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Running glxinfo | grep renderer gives the output:
| Code: |
direct rendering: Yes
GLX_MESA_query_renderer, GLX_MESA_swap_control, GLX_NV_float_buffer,
GLX_MESA_query_renderer, GLX_MESA_swap_control, GLX_OML_swap_method,
Extended renderer info (GLX_MESA_query_renderer):
OpenGL renderer string: AMD Radeon RX 6900 XT (sienna_cichlid, LLVM 14.0.6, DRM 3.48, 6.0.0-pf2)
GL_ARB_compute_variable_group_size, GL_ARB_conditional_render_inverted,
GL_IBM_multimode_draw_arrays, GL_INTEL_blackhole_render,
GL_NV_conditional_render, GL_NV_copy_image, GL_NV_depth_clamp,
GL_ARB_compute_variable_group_size, GL_ARB_conditional_render_inverted,
GL_INTEL_blackhole_render, GL_KHR_blend_equation_advanced,
GL_NV_compute_shader_derivatives, GL_NV_conditional_render,
GL_EXT_render_snorm, GL_EXT_robustness, GL_EXT_sRGB_write_control,
GL_INTEL_blackhole_render, GL_KHR_blend_equation_advanced,
GL_NV_conditional_render, GL_NV_draw_buffers, GL_NV_fbo_color_attachments,
GL_OES_element_index_uint, GL_OES_fbo_render_mipmap,
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I can use the nvidia-smi and radeontop programs to monitor GPU usage for difference applications, and some use the AMD card while others use the NVIDIA card. How can I force all applications to use the AMD card by default and prevent the NVIDIA kernel module from being automatically loaded? |
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CooSee
Veteran
Joined: 20 Nov 2004
Posts: 1441
Location: Earth
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| Posted: Sat Nov 05, 2022 5:10 pm Post subject: |
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hello,
https://github.com/swaywm/sway/wiki#i-have-a-multi-gpu-setup-like-intelnvidia-or-intelamd-and-sway-does-not-start
search for WLR_DRM_DEVICES
| Code: | # Multi-GPU
export WLR_DRM_DEVICES=/dev/dri/card0 |
i can't tell or help you more, because i only use one Graphics - i'am not so rich like you 
you can add the varaible in your users .profile or /etc/enviroment (<<< for global use).
this is from my users .profile:
| Code: | cat /home/myuser/.profile
export MOZ_ENABLE_WAYLAND=1
export MOZ_WAYLAND_USE_VAAPI=1
export MOZ_DBUS_REMOTE=1
export GDK_BACKEND=wayland
export XDG_CURRENT_DESKTOP=sway
export XDG_SESSION_DESKTOP=sway
export XDG_SESSION_TYPE=wayland
export EDITOR=/usr/bin/geany
export BROWSER=firefox |
i hope it'll help you somehow.
_________________
" Die Realität ist eine Illusion, die durch Mangel an ehrlicher Kommunikation entsteht "
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" Der Mensch ist von Natur aus neugierig, was am Ende übrig bleibt ist die Gier " |
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thebigdill97
n00b
Joined: 20 Apr 2022
Posts: 13
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| Posted: Sat Nov 19, 2022 9:48 pm Post subject: |
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Thanks for the response. I only see one the nvidia card in /dev/dri. Could it be that the AMD card doesn't show up because the drivers are built into the kernel (instead of as loadable modules)?
One other update is that I was able to force the usage of the AMD card by simply removing the nvidia-drivers package or by overriding the driver to use vfio-pci driver for the nvidia card. Obviously both of these have the side effects that I cannot use the nvidia card at all on my main system. |
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deno
Guru
Joined: 13 Sep 2006
Posts: 411
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| Posted: Mon Dec 11, 2023 4:34 pm Post subject: |
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| Did you actually try using them as module? Somewhere I have seen people having other issues with the built in driver. |
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