v0.20.1 can't find right adapter for my old computer.

[alexniver]

Description
I have a very old computer with DiscreteGpu and IntegratedGpu.

on v0.20.1, wgpu only use IntegratedGpu
on v0.18.0, wgpu use DiscreteGpu, this is right
on v0.19 wgpu can't find adapter #5164 , this issue is fixed for me

Repro steps
on v0.18.0

cargo run --bin hello-triangle

output

AdapterInfo { name: "AMD Radeon R5 M435 (RADV HAINAN)", vendor: 4098, device: 26213, device_type: DiscreteGpu, driver: "radv", driver_info: "Mesa 24.1.1-arch1.1", backend: Vulkan }

on v0.20.1, run

WGPU_POWER_PREF=high cargo run hello_triangle

output

AdapterInfo { name: "Mesa Intel(R) HD Graphics 620 (KBL GT2)", vendor: 32902, device: 0, device_type: IntegratedGpu, driver: "OpenGL", driver_info: "4.6 (Compatibility Profile) Mesa 24.1.1-arch1.1", backend: Gl }

Expected vs observed behavior
wgpu should always use discrete gpu.

Platform
os: archlinux
wgpu version: v0.20.1

[Wumpf]

@alexniver can you post a dump of wgpu-info --verbose? might be helpful to understand why it wouldn't pick your amd gpu
also a RUST_LOG=trace of the portion on hello_triangle that shows the adapter selection

[alexniver]

@alexniver can you post a dump of wgpu-info --verbose? might be helpful to understand why it wouldn't pick your amd gpu also a RUST_LOG=trace of the portion on hello_triangle that shows the adapter selection

v0.20.1 run cargo run --bin wgpu-info --verbose

WARNING: radv is not a conformant Vulkan implementation, testing use only.
Adapter 0:
	         Backend: Gl
	            Name: Mesa Intel(R) HD Graphics 620 (KBL GT2)
	        VendorID: 0x8086
	        DeviceID: 0x0
	            Type: IntegratedGpu
	          Driver: OpenGL
	      DriverInfo: 4.6 (Compatibility Profile) Mesa 24.1.1-arch1.1
	WebGPU Compliant: false

v0.18.0 run cargo run --bin wgpu-info --verbose
v0.18.0_wgpu_info.txt

v0.20.1 run RUST_LOG=trace cargo run hello_triangle
v0.20.1_trace_info.txt

v0.18.0 run RUST_LOG=trace cargo run --bin hello-triangle
v0.18.0_trace_info.txt

[cwfitzgerald]

That warning from mesa is exactly why it's not letting your and card through. Radv isn't conformant on your amd card, and we filter out all non-conformant implementations by default, falling back in opengl, where we can't actually pick which adapter we get.

[alexniver]

That warning from mesa is exactly why it's not letting your and card through. Radv isn't conformant on your amd card, and we filter out all non-conformant implementations by default, falling back in opengl, where we can't actually pick which adapter we get.

oh, I know, so this is not a issue, I will close.