[Bug 46360] New: wine+dxvk black game window switch back to vtx from vt7

https://bugs.winehq.org/show_bug.cgi?id=46360

Bug ID: 46360
           Summary: wine+dxvk black game window switch back to vtx from
                    vt7
           Product: Wine
           Version: 3.21
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

OS: debian9 stable kernel 4.18
    GPU: intel+nvdia
    Driver: mesa 18.2 + intel modesetting + nvidia driver
    Wine version: x86_64 bit wine-staging 3.21 precompiled binary
    DXVK version: 0.94

i start another xserver from another tty such as vt2 but not default vt7 so can
use nvidia as primary video card, launch dx11 game with wine+dxvk then switch
back to vt7 and switch back again, the game window totally black never restore.

from vtx run glxgeas or wine dx11 game with buildin dlls, or wine dx9 game with
native or buildin d3dx9_xx.dll, switch between vtx-vt7 the glxgeas or game
window restore quickly without any errors.

if from vt7 run DISPLAY=:1 glxgeas or wine dx11 game.exe with buildin dlls, its
fine, switch vts fine. 
if run DISPLAY=:1 with wine+dxvk failed to launch game exe with dxvk error:
D3D11CoreCreateDevice: Failed to create D3D11 device.

its not dxvk bug like the author said. so maybe its about wine (vulkan part)?