Comment 6 for bug 1635339

I put my money on that one:

https://cgit.freedesktop.org/spice/win32/qxl-wddm-dod/commit/?id=f6e099db39e7d0787f294d5fd0dce328b5210faa

commit f6e099db39e7d0787f294d5fd0dce328b5210faa
Author: Sameeh Jubran <email address hidden>
Date: Sun Sep 11 16:05:24 2016 +0300

    Use the second bar (VRAM) for qxl command buffer.

    Based on a patch by Sandy Stutsman <email address hidden>

    Signed-off-by: Sameeh Jubran <email address hidden>
    Acked-by: Frediano Ziglio <email address hidden>