Operating system: Linux-4.15.0-58-generic-x86_64-with-debian-buster-sid 64 Bits
Graphics card: GeForce GTX 960/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 430.40
Broken: version: 2.81 (sub 8), branch: master, commit date: 2019-09-06 10:48, hash: rB4c20c53b8980
Short description of error
Open the Blend file in 2.80 and 2.81/master:
You compare what the sofa-arms looks like. In 2.81 it looks dark on Eevee. If you flip normals of the entire mesh then it looks right.
The problem does not occur with Cycles in 2.80/2.81. The problem also does not occur in Eevee in 2.80.