[Bug 42509] New: The Witcher 3 hangs the system on startup

https://bugs.winehq.org/show_bug.cgi?id=42509

Bug ID: 42509
           Summary: The Witcher 3 hangs the system on startup
           Product: Wine-staging
           Version: 2.2
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
                CC: [e-mail], [e-mail],
                    [e-mail]
      Distribution: ---

Created attachment 57398
  --> https://bugs.winehq.org/attachment.cgi?id=57398
Wine log (The Witcher 3 hangs system)

Since update of wine-staging to 2.2, Witcher 3 started hanging hard on startup.
The screen goes black, and keyboard becomes completely unresponsive. The system
can still be rebooted if accessed for example from another machine over ssh.

OS: Debian testing, x86-64, KDE Plasma 5.8.4.
Graphics: AMD RX480, Mesa / Gallium 0.4 on AMD POLARIS10 (DRM
3.8.0/4.9.0-1-amd64, LLVM 3.9.1)

See attached Wine log.