FS#66343 - [blender] 2.82a Combined rendering doesn't work

Attached to Project: Community Packages
Opened by Carlos Santacruz (cfsa900) - Tuesday, 21 April 2020, 20:58 GMT
Last edited by freswa (frederik) - Thursday, 23 April 2020, 16:45 GMT
Task Type Bug Report
Category Packages
Status Closed
Assigned To Sven-Hendrik Haase (Svenstaro)
Filipe Laíns (FFY00)
Architecture All
Severity Medium
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No

Details

Using the cycles render engine, which allows the use of GPU(s) and CPU in tandem, doesn't complete a render. The CPU cores used show 100% activity but the tiles they work on are never completed while the ones on the GPU work normally. Rendering on only CPU or GPU works correctly.

Downloaded and tried with the self contained executable from blender.org and it works as expected.

Both the downloaded and pacman installed are version 2.82a

Running on an ASUS FX505DY laptop (Ryzen5 3550H + RX 560X)
This task depends upon

Closed by  freswa (frederik)
Thursday, 23 April 2020, 16:45 GMT
Reason for closing:  Fixed
Additional comments about closing:  2.82.a-2
Comment by Sven-Hendrik Haase (Svenstaro) - Thursday, 23 April 2020, 05:18 GMT
I don't think is necessarily a packaging bug as we're really not doing anything special in our package. Rather than that, it sounds like an upstream issue triggered by our build environment. Particularly I suspect our gcc 9.3.0 to be the problem and that upstream doesn't use quite such a recent version of gcc. Please report the issue upstream and link the report here.
Comment by Carlos Santacruz (cfsa900) - Thursday, 23 April 2020, 16:32 GMT
Update pushed earlier today (from version 2.82.a-1 to 2.82.a-2) has fixed the issue.
Regarding upstream, I decided to report here since after a search I found out someone describing the same issues although on nVidia hardware (https://developer.blender.org/T73068) and I assumed that the answer would have been the same in my case since, again and similar to that report, the downloaded version works as intended:
>The blender foundation does not provide these so you will have to reach out to the provider of the package. Likely they are using a package, library, or compiler that we do not officially support.
>I am closing because there is nothing we can do. Please try to report the bug to the package provider.

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