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When I connect the new Denoise Node it appears in Black
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Description

System Information
Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: GeForce 8400 GS/PCIe/SSE2 NVIDIA Corporation 3.3.0

Blender Version
Broken: version: 2.81 (sub 2), branch: master, commit date: 2019-08-20 07:45, hash: rBf2cab8267f22
Worked: (optional)

Short description of error
When I connect the new Denoise Node it appears in Black

Exact steps for others to reproduce the error
I connect the new Denoise Node in the composer and the Render appears in Black

Event Timeline

Brecht Van Lommel (brecht) triaged this task as Needs Information from User priority.

Please attach a simple example .blend file to reproduce the problem.

I have same issue.
Screenshot: https://i.imgur.com/wyND39m.png
.blend file:


System Information
Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: AMD Radeon (TM) R9 380 Series ATI Technologies Inc. 4.5.13547 Core Profile Context 25.20.15031.1000

Blender Version
Broken: version: 2.81 (sub 3), branch: master, commit date: 2019-08-20 22:35, hash: rBdaba3e871ff5

Same here.
version: 2.81 (sub 3), branch: master, commit date: 2019-08-24 07:02, hash: b7f786c0b150, type: Release
GeForce GTX 750 Ti OC
AMD Phenom II X4 965 CPU
Win 10 x64

here work fine with @Evgeny (mortuusars) .blend test file on linux Blender 2.81 daba3e871ff5 (2019-08-20) AMD FX8350, 16GB DDR3, GTX690 2+2 GB VRam- Nvidia drivers 435.17, Factory Setting applied, LoadUI and Trusted Source disabled in file browser

Having the same problem with OIDN giving a black render result every time.
blender-2.81-daba3e871ff5-linux-glibc217-x86_64
Linux 4.15, 8GB DDR2, GeForce GTX 970, Nvidia driver 430.26

I can't reproduce the problem. Which CPU model do you have?

AMD Athlon(tm) 64 X2 Dual Core Processor 4400+ (family: 0xf, model: 0x6b, stepping: 0x1)
cpu MHz: 2300
cache size: 512kB (x2)

I think for Open Image Denoiser you need a cpu with SSE 4.1 or greater. Your cpu is too old!
See: https://openimagedenoise.github.io/
You can download cpu-z and see the extensions your cpu provides.

Ok, thanks @Marcus Papathoma (machieb) that's the explanation. On Linux /proc/cpuinfo shows the CPU feature flags which for me includes sse and sse2 but no higher.
Us with an old CPU but a newer Nvidia GPU can still use the Optix/Cuda denoiser and related Blender add-ons.

Brecht Van Lommel (brecht) raised the priority of this task from Needs Information from User to Confirmed, Medium.

I've mentioned this requirement in the release notes now. But I still think there should be some indication in the user interface.

@Lauri Hastholm (laurijh) I don't have a CPU without SSE4.1, it would be great if you could leave feedback here if my fix worked for you. On unsupported CPUs, you should now see a message in the node itself and it should now act as a passthrough instead of returning a black image.

Commit d547f9d3d291 breaks builds, it's missing the BLi_system.h header on source/blender/editors/space_node/drawnode.c.

diff --git a/source/blender/editors/space_node/drawnode.c b/source/blender/editors/space_node/drawnode.c
index 72a73f89227..b89f163f579 100644
--- a/source/blender/editors/space_node/drawnode.c
+++ b/source/blender/editors/space_node/drawnode.c
@@ -24,6 +24,7 @@
 
 #include "BLI_blenlib.h"
 #include "BLI_math.h"
+#include "BLI_system.h"
 
 #include "DNA_node_types.h"
 #include "DNA_object_types.h"

@Lauri Hastholm (laurijh) I don't have a CPU without SSE4.1, it would be great if you could leave feedback here if my fix worked for you. On unsupported CPUs, you should now see a message in the node itself and it should now act as a passthrough instead of returning a black image.

After a quick test I can say that it does work. There is a message saying that the node is disabled because SSE4.1 is required and the node act as a passthrough.