I currently have a RTX 2070 Super and a RTX 3090. I would like to use the 2070 as the source for my displays and have it be used to do all of the desktop environment rendering. As for the 3090, I want to use it to render games to the display that the 2070 is connected to. I looked into this and PRIME seems to be what I am looking for. I tried setting it up but it doesn’t work for anything vulkan based and when I do prime-run vkcube it just gives the message: Selected GPU 0: NVIDIA GeForce RTX 3090, type: DiscreteGpu Could not find both graphics and present queues Is Nvidia to Nvidia prime possible with vulkan?
https://forums.developer.nvidia.com/t/vulkan-prime-fail-on-dual-nvidia-gpu-system/213084/3?u=generix
I tried this, and vulkan still selects the 2070 rather than the 3090. If I try selecting the gpu with --gpu_number it again gives the same error about graphics and present queues.
prime-run is a wrapper around this:
__NV_PRIME_RENDER_OFFLOAD=1 __GLX_VENDOR_LIBRARY_NAME=nvidia command
Try doing this instead of prime-run (replacing 1 with whatever number corresponds to your GPU), while also passing in the vulkan --gpu-number parameter. E.g.
__NV_PRIME_RENDER_OFFLOAD=1 __GLX_VENDOR_LIBRARY_NAME=nvidia myfavoritegame --gpu-number=1
or the steam equivalent
__NV_PRIME_RENDER_OFFLOAD=1 __GLX_VENDOR_LIBRARY_NAME=nvidia %command% --gpu-number=1
I haven’t tested this myself.
Just tried it, steam games will open a process on the 3090 but a second instance opens on the 2070 and all of the rendering happens on the 2070 (3090 gpu clock stays low and power usage is low). vkcube gives the same error.
I do not know then, perhaps another will chime in.
Either this or this should work
https://docs.mesa3d.org/envvars.html#envvar-MESA_VK_DEVICE_SELECT
Second one needs this package on Arch, don’t know the other distros.
https://archlinux.org/packages/extra/x86_64/vulkan-mesa-layers/
MESA_VK_DEVICE_SELECT=list vulkaninfo
After getting pci adress of it:
MESA_VK_DEVICE_SELECT="xx:yz" as an env var.
Running:
MESA_VK_DEVICE_SELECT=list vulkaninfo
returns:
GPU 0: 10de:1e84 "NVIDIA GeForce RTX 2070 SUPER" discrete GPU 0000:04:00.0
GPU 1: 10de:2204 "NVIDIA GeForce RTX 3090" discrete GPU 0000:0a:00.0
Running:
vulkaninfo --summary
returns:
==========
VULKANINFO
==========
Vulkan Instance Version: 1.3.269
Instance Extensions: count = 23
-------------------------------
VK_EXT_acquire_drm_display : extension revision 1
VK_EXT_acquire_xlib_display : extension revision 1
VK_EXT_debug_report : extension revision 10
VK_EXT_debug_utils : extension revision 2
VK_EXT_direct_mode_display : extension revision 1
VK_EXT_display_surface_counter : extension revision 1
VK_EXT_surface_maintenance1 : extension revision 1
VK_EXT_swapchain_colorspace : extension revision 4
VK_KHR_device_group_creation : extension revision 1
VK_KHR_display : extension revision 23
VK_KHR_external_fence_capabilities : extension revision 1
VK_KHR_external_memory_capabilities : extension revision 1
VK_KHR_external_semaphore_capabilities : extension revision 1
VK_KHR_get_display_properties2 : extension revision 1
VK_KHR_get_physical_device_properties2 : extension revision 2
VK_KHR_get_surface_capabilities2 : extension revision 1
VK_KHR_portability_enumeration : extension revision 1
VK_KHR_surface : extension revision 25
VK_KHR_surface_protected_capabilities : extension revision 1
VK_KHR_wayland_surface : extension revision 6
VK_KHR_xcb_surface : extension revision 6
VK_KHR_xlib_surface : extension revision 6
VK_LUNARG_direct_driver_loading : extension revision 1
Instance Layers: count = 14
---------------------------
VK_LAYER_FROG_gamescope_wsi_x86_64 Gamescope WSI (XWayland Bypass) Layer (x86_64) 1.3.221 version 1
VK_LAYER_INTEL_nullhw INTEL NULL HW 1.1.73 version 1
VK_LAYER_KHRONOS_validation Khronos Validation Layer 1.3.268 version 1
VK_LAYER_LUNARG_api_dump LunarG API dump layer 1.3.250 version 2
VK_LAYER_LUNARG_monitor Execution Monitoring Layer 1.3.250 version 1
VK_LAYER_LUNARG_screenshot LunarG image capture layer 1.3.250 version 1
VK_LAYER_MESA_device_select Linux device selection layer 1.3.211 version 1
VK_LAYER_MESA_overlay Mesa Overlay layer 1.3.211 version 1
VK_LAYER_NV_optimus NVIDIA Optimus layer 1.3.260 version 1
VK_LAYER_VALVE_steam_fossilize_32 Steam Pipeline Caching Layer 1.3.207 version 1
VK_LAYER_VALVE_steam_fossilize_64 Steam Pipeline Caching Layer 1.3.207 version 1
VK_LAYER_VALVE_steam_overlay_32 Steam Overlay Layer 1.3.207 version 1
VK_LAYER_VALVE_steam_overlay_64 Steam Overlay Layer 1.3.207 version 1
VK_LAYER_VKBASALT_post_processing a post processing layer 1.3.223 version 1
Devices:
========
GPU0:
apiVersion = 1.3.260
driverVersion = 545.29.6.0
vendorID = 0x10de
deviceID = 0x1e84
deviceType = PHYSICAL_DEVICE_TYPE_DISCRETE_GPU
deviceName = NVIDIA GeForce RTX 2070 SUPER
driverID = DRIVER_ID_NVIDIA_PROPRIETARY
driverName = NVIDIA
driverInfo = 545.29.06
conformanceVersion = 1.3.6.0
deviceUUID = b5291141-3ff6-f8bf-c85d-2f8e52fc144d
driverUUID = 468717c2-5245-5d6d-9401-72b8a4ff98e5
GPU1:
apiVersion = 1.3.260
driverVersion = 545.29.6.0
vendorID = 0x10de
deviceID = 0x2204
deviceType = PHYSICAL_DEVICE_TYPE_DISCRETE_GPU
deviceName = NVIDIA GeForce RTX 3090
driverID = DRIVER_ID_NVIDIA_PROPRIETARY
driverName = NVIDIA
driverInfo = 545.29.06
conformanceVersion = 1.3.6.0
deviceUUID = b57a16e3-308d-9773-fddb-b863910a9c41
driverUUID = 468717c2-5245-5d6d-9401-72b8a4ff98e5
Running:
MESA_VK_DEVICE_SELECT=10de:2204 vkcube
returns:
Selected GPU 0: NVIDIA GeForce RTX 3090, type: DiscreteGpu
Could not find both graphics and present queues
The same happens when using vkdevicechooser. Could the issue be that vulkan only creates queues for the driver (which both gpus are using the same driver). I’m not too familiar with how vulkan works, I’m just trying to best make sense of the behavior.