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switching from EEVEE to Cycles freezes blender and requires blender to be closed from the task bar.
Open, Waiting for Developer to ReproducePublic

Description

System Information
Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.70

Blender Version
Broken: version: 2.81 (sub 4), branch: master, commit date: 2019-08-31 11:22, hash: rB82ef1edce4a2
Worked: (optional)

Short description of error
switching from EEVEE to Cycles freezes blender and requires blender to be closed from the task bar.

Exact steps for others to reproduce the error
go into rendered viewport with eevee enabled, then switch to cycles whilst still in the rendered viewport mode.

Details

Type
Bug

Event Timeline

Abid Maqbool (cto.abid) lowered the priority of this task from Needs Triage by Developer to Needs Information from User.EditedSep 1 2019, 10:24 AM

Here fine, Blender 2.81 (sub 4) 2019-08-31 17:53 rB883706395ee3

Try with File -> Defaults -> Load Factory Setting & Every time freezes?

Let we know. Thanks

works with the default cube scene after reverting to factory defaults, but as soon as I load in this file and switch from EEVEE to cycles, then it gets stuck on updating lights (viewport remains responsive but not rendered, and then if changing another render setting it freezes). The same problem occurs when whilst in render mode viewport if you switch from an EEVEE scene to another scene (in the same file) which has cycles set as the renderer.

Because it's not happening with the default scene, it must be related to one of the light settings or materials in this scene (although it has happened in multiple files):

Provided file is still working fine, with:

Operating system: Windows-10-10.0.16299 64 Bits
Graphics card: AMD Radeon HD 8400 / R3 Series ATI Technologies Inc. 4.5.13399 Core Profile Context 15.200.1065.0

Blender 2.81 (sub 4) 2019-08-31 17:53 rB883706395ee3

@michael campbell (3di) Maybe, you have messed-up some setting... not sure

You can try:

  • File -> Defaults -> Load Factory Settings && File -> Defaults -> Save Startup File (although by this action, your custom settings will be lost, check at your own risk)

Thanks.

I tried resetting to factory defaults and then immediately opening the file, but the issue still arose. This has happened on multiple scenes. I notice you have an AMD gpu, so perhaps there's something in the code not playing nicely with nvidia drivers?

Bastien Montagne (mont29) raised the priority of this task from Needs Information from User to Waiting for Developer to Reproduce.Sep 9 2019, 8:27 PM

Note that 431.70 are not latest NVidia driver available…

@Brecht Van Lommel (brecht) or @Clément Foucault (fclem) might have insights here too?