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Maniphest T79818

Blender 2.81 - 2.90: Applying more than one material on a mesh object does not work on Linux System
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Description

System Information
Operating system: Linux-5.0.0-15-generic-x86_64-with-debian-buster-sid 64 Bits
Graphics card: AMD TAHITI (DRM 2.50.0, 5.0.0-15-generic, LLVM 10.0.1) X.Org 4.5 (Core Profile) Mesa 20.2.0-devel (git-e2e89fb 2020-07-25 bionic-oibaf-ppa)

Blender Version
Broken: version: >2.81, 2.83.4, branch: master, commit date: 2020-08-05 06:00, hash: rBc113af82881a, blender-2.90.0-c300fc56c3cc-linux64
Worked: blender-2.80-linux-glibc217-x86_64

Short description of error

Origin is a double cube with two others and assigned materials.
Shading Tab -> Material Properties icon
Plus sign -> New button (Add a new material)
Edit Mode -> Face selected -> Assign button
In edit mode, both assigned parts are visible. After switching to the object mode, the one assigned to the second material disappears.
Only first material is rendered. If materials order is swapped then another is rendered (always first).
This issue affects versions: 2.81 - 2.83.4, in: solid mode, material mode and render preview (Eevee). 
In: vieport shading mode and render preview (Cycles) is OK
In the earlier version 2.80, both materials were rendered correctly

Related bug reports
T72228, T68826, T70106

28.blend771 KBDownload

v2.80.0.system-info.txt11 KBDownload

v2.83.4.system-info.txt11 KBDownload

video-info.txt2 KBDownload

Related Objects

Event Timeline

Pawel Kruczynski (kruk) created this task.Aug 16 2020, 6:34 AM
Pawel Kruczynski (kruk) updated the task description. (Show Details)Aug 16 2020, 6:45 AM
Robert Guetzkow (rjg) changed the task status from Needs Triage to Needs Information from User.Aug 16 2020, 11:45 AM
Robert Guetzkow (rjg) added a subscriber: Robert Guetzkow (rjg).

It seems you're using a development version of Mesa from a PPA. Have you checked if this issue also occurs when using a stable/official release?

Robert Guetzkow (rjg) added a project: EEVEE & Viewport.Aug 16 2020, 11:45 AM
Pawel Kruczynski (kruk) added a comment.Aug 16 2020, 9:45 PM

@Robert Guetzkow (rjg): Due to other dependencies, I couldn't install the previous stable version. I just add that I have upgraded the system, the kernel and upgraded the version to Mesa 20.3.0-devel (git-6668d7a 2020-08-16 bionic-oibaf-ppa). Unfortunately, I still have same problem. I'm beginning to suspect that it may have something to do with the graphics card (Asus R9280X-DC2T-3GD5), and not only on Linux. I checked on the old Windows 7 system and the lower part of the cube is displayed, but strange artifacts appear. Before that, I didn't see any problems with 3D games. In 2.80 I can see the model correctly. Strange

Robert Guetzkow (rjg) added a comment.Aug 16 2020, 10:38 PM

The graphics chip in that GPU is Radeon™ R9 280 which has the GCN first generation micro-architecture. It meets the minimum requirements as far as I can tell.

Robert Guetzkow (rjg) changed the task status from Needs Information from User to Needs Triage.Aug 30 2020, 1:16 AM
Ankit Meel (ankitm) closed this task as a duplicate of T80595: Assigning multiple materials to one face makes it invisible.Apr 18 2021, 3:04 PM