Principled BSDF completely broken #69362

New Issue

Frank · 2019-08-31T16:39:06+02:00

Frank commented

2019-08-31 16:39:06 +02:00

System Information
Operating system: Ubuntu Studio (Ubuntu 18.4)
Graphics card: Advanced Micro Devices, Inc. [AMD/ATI] Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM]

Blender Version
Broken: 2.80 (as in the download blender-2.80-linux-glibc217-x86_64.tar.bz2
(no further information on the splash screen)
Worked: (optional)

Short description of error
When I use the Principled BSDF the object becomes dark violet in the preview (green with unexplainable shadows on it when the lamp is changed to Sun).
The final render shows the same effects.
Diffuse BSDF works as expected.

Exact steps for others to reproduce the error
Open Blender and in the default scene add a Material Node Principled BSDF.

Remark: I found some Bug reports for Principled BSDF from 02.08. and for 17.18. that is was fixed on Google.
My Download was from 01.08. so I downloaded again today. - No change.

I'll add some screenshots.

Regards
Frank

**System Information** Operating system: Ubuntu Studio (Ubuntu 18.4) Graphics card: Advanced Micro Devices, Inc. [AMD/ATI] Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM] **Blender Version** Broken: 2.80 (as in the download blender-2.80-linux-glibc217-x86_64.tar.bz2 (no further information on the splash screen) Worked: (optional) **Short description of error** When I use the Principled BSDF the object becomes dark violet in the preview (green with unexplainable shadows on it when the lamp is changed to Sun). The final render shows the same effects. Diffuse BSDF works as expected. **Exact steps for others to reproduce the error** Open Blender and in the default scene add a Material Node Principled BSDF. Remark: I found some Bug reports for Principled BSDF from 02.08. and for 17.18. that is was fixed on Google. My Download was from 01.08. so I downloaded again today. - No change. I'll add some screenshots.![Bugreport_31.08.2019.png](https://archive.blender.org/developer/F7711989/Bugreport_31.08.2019.png) Regards Frank

Frank commented

2019-08-31 16:39:06 +02:00

Added subscriber: @fsdoma

Robert Guetzkow commented

2019-08-31 17:12:59 +02:00

Added subscriber: @rjg

Robert Guetzkow commented

2019-08-31 17:12:59 +02:00

Which graphics card of the several ones listed are you actually using? The Radeon HD 6450 has the old Terascale architecture and is no longer supported by Blender 2.8. It requires GCN first generation or later .

Please update your graphics driver and check if that resolves the problem.

Which graphics card of the several ones listed are you actually using? The Radeon HD 6450 has the old Terascale architecture and is no longer supported by Blender 2.8. [It requires GCN first generation or later ](https://www.blender.org/download/requirements/). Please update your graphics driver and check if that resolves the problem.

Frank commented

2019-09-01 07:50:07 +02:00

I don't know how to find the information you ask for. All commands (lshw, glxinfo, ...) brings only what I sent.
In regard to the driver - I am running kernel 4.15.0-58-lowlatency #64-Ubuntu SMP PREEMPT
and don't know how to update a driver.
I have looked for "GCN" in the list of graphic cards from your link. This combination of letters is not in present there.
Yes, it could be that I need more recent HW but how to figure out what I need?
I plan to upgrade to an 8-core system with more RAM anyway so this would be a good possibility to bring the GPU in line too ;)

BTW: If I combine the nodes the old way (not using the new single one) all works as expected.

I don't know how to find the information you ask for. All commands (lshw, glxinfo, ...) brings only what I sent. In regard to the driver - I am running kernel 4.15.0-58-lowlatency #64-Ubuntu SMP PREEMPT and don't know how to update a driver. I have looked for "GCN" in the list of graphic cards from your link. This combination of letters is not in present there. Yes, it could be that I need more recent HW but how to figure out what I need? I plan to upgrade to an 8-core system with more RAM anyway so this would be a good possibility to bring the GPU in line too ;) BTW: If I combine the nodes the old way (not using the new single one) all works as expected.

Frank commented

2019-09-01 08:08:22 +02:00

Hi once more (I was not root) :/
lspci -v -s $(lspci | grep ' VGA ' | cut -d" " -f 1)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM] (prog-if 00 [VGA controller])
Subsystem: PC Partner Limited / Sapphire Technology Radeon HD 6450 1 GB DDR3
Flags: bus master, fast devsel, latency 0, IRQ 55
Memory at c0000000 (64-bit, prefetchable) [size=256M]
Memory at fea20000 (64-bit, non-prefetchable) [size=128K]
I/O ports at e000 [size=256]
Expansion ROM at 000c0000 [disabled] [size=128K]
Capabilities: [50] Power Management version 3
Capabilities: [58] Express Legacy Endpoint, MSI 00
Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010
Capabilities: [150] Advanced Error Reporting
Kernel driver in use: radeon
Kernel modules: radeon

Radeon HD 6450 - so I have an unsupported card.
How do I find one which is a GCN first or later for a replacement?
This information is in the descriptions of the e-shops I use to buy such things neither.

Hi once more (I was not root) :/ lspci -v -s $(lspci | grep ' VGA ' | cut -d" " -f 1) 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM] (prog-if 00 [VGA controller]) Subsystem: PC Partner Limited / Sapphire Technology Radeon HD 6450 1 GB DDR3 Flags: bus master, fast devsel, latency 0, IRQ 55 Memory at c0000000 (64-bit, prefetchable) [size=256M] Memory at fea20000 (64-bit, non-prefetchable) [size=128K] I/O ports at e000 [size=256] Expansion ROM at 000c0000 [disabled] [size=128K] Capabilities: [50] Power Management version 3 Capabilities: [58] Express Legacy Endpoint, MSI 00 Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+ Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?> Capabilities: [150] Advanced Error Reporting Kernel driver in use: radeon Kernel modules: radeon Radeon HD 6450 - so I have an unsupported card. How do I find one which is a GCN first or later for a replacement? This information is in the descriptions of the e-shops I use to buy such things neither.

Robert Guetzkow commented

2019-09-01 10:20:11 +02:00

You can find an overview of the AMD GPU generation on [Wikipedia ]]. Pretty much all cards release since 2012 fulfill the minimum requirements for running Blender. Note that GPU rendering has [ https:*docs.blender.org/manual/en/latest/render/cycles/gpu_rendering.html#amd-opencl | higher requirements which is GCN second generation.

You may be able to run Blender with updated drivers, but it's not officially supported and issues like the one you encountered may happen.

You can find an overview of the AMD GPU generation on [Wikipedia ]]. Pretty much all cards release since 2012 fulfill the minimum requirements for running Blender. Note that GPU rendering has [[ https:*docs.blender.org/manual/en/latest/render/cycles/gpu_rendering.html#amd-opencl | higher requirements ](https:*en.wikipedia.org/wiki/List_of_AMD_graphics_processing_units) which is GCN second generation. You may be able to run Blender with updated drivers, but it's not officially supported and issues like the one you encountered may happen.

Robert Guetzkow commented

2019-09-01 10:24:23 +02:00

Changed status from 'Open' to: 'Archived'

Robert Guetzkow closed this issue

2019-09-01 10:24:23 +02:00

Robert Guetzkow self-assigned this 2019-09-01 10:24:23 +02:00

Robert Guetzkow commented

2019-09-01 10:24:23 +02:00

I'm closing this ticket since the issue seems to be caused by unsupported hardware.

noki paike commented

2019-09-01 13:02:48 +02:00

Added subscriber: @nokipaike

noki paike commented

2019-09-01 13:02:48 +02:00

@rjg
Guys with this excuse of the obsolete GPUs are making a mess of misery.
there is no official support, not that they don't work with this hardware.

@fsdoma
update to the latest version of ubuntu (the better way)
or install the last mesa padoka drivers ppa

then start blender with

R600_DEBUG=nosl ./blender

blender will work perfectly, but at the expense of compiling eevee shaders, which will be slower..... until the Mesa guys (or some blender dev) will decide to solve anothertrivial problem of lights and shadow which is not this.

https://devtalk.blender.org/t/amd-r600-mesa-linux-driver-eevee-broken

@rjg Guys with this excuse of the obsolete GPUs are making a mess of misery. **there is no official support**, not that they don't work with this hardware. @fsdoma update to the latest version of ubuntu (the better way) or install the last mesa [padoka drivers ppa ](https://launchpad.net/~paulo-miguel-dias/+archive/ubuntu/mesa) then start blender with ``` R600_DEBUG=nosl ./blender ``` blender will work perfectly, but at the expense of compiling eevee shaders, which will be slower..... until the Mesa guys (or some blender dev) will decide to solve another**trivial problem** of lights and shadow which is not this. https://devtalk.blender.org/t/amd-r600-mesa-linux-driver-eevee-broken

Robert Guetzkow commented

2019-09-01 13:24:05 +02:00

@nokipaike which is exactly what I wrote. It's not supported, but it may work with updated drivers.

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