https://bugs.freedesktop.org/show_bug.cgi?id=108940

--- Comment #6 from Stefan <stfn+freedesktop@hijnn.net> ---
Nope, exactly the same error is present with your setup:

System:
  Host: spin Kernel: 4.20.0-042000rc5-generic x86_64 bits: 64 
  Desktop: Gnome 3.30.1 Distro: Ubuntu 18.10 (Cosmic Cuttlefish) 
Machine:
  Type: Desktop Mobo: ASRock model: AB350 Gaming-ITX/ac 
  serial: <root required> UEFI [Legacy]: American Megatrends v: P4.90 
  date: 10/08/2018 
CPU:
  Quad Core: AMD Ryzen 5 2400G with Radeon Vega Graphics type: MT MCP 
  speed: 1418 MHz min/max: 1600/3600 MHz 
Graphics:
  Device-1: AMD Raven Ridge [Radeon Vega Series / Radeon Vega Mobile Series] 
  driver: amdgpu v: kernel 
  Display: x11 server: X.Org 1.20.1 driver: amdgpu 
  resolution: 3440x1440~60Hz 
  OpenGL: 
  renderer: AMD RAVEN (DRM 3.27.0 4.20.0-042000rc5-generic LLVM 7.0.1) 
  v: 4.5 Mesa 19.0.0-devel (git-cc6a5e9 2018-12-08 cosmic-oibaf-ppa)

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