[Bug 56002] New: Adaptive sync results in transient halved refresh rate with winewayland

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=56002

Bug ID: 56002
           Summary: Adaptive sync results in transient halved refresh rate
                    with winewayland
           Product: Wine
           Version: 9.0-rc1
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Component: winewayland.drv

When running Cyberpunk 2077 using winewayland (vkd3d-proton/dxvk's dxgi set up
in the prefix with Wine 9.0-rc1 + esync), there is a transient issue when
monitor's refresh rate drops to half of the game framerate instead of matching
it as adaptive sync should do.

DE: KDE Plasma 5.27.9.

I measure game framerate with MangoHud and monitor's refresh rate with
on-screen OSD. With winex11 they match, with winewayland they match most of the
time, but sometimes refresh rate is halved. So for example the game would have
128 fps and OSD will show 64 Hz.

Since it only happens with winewayland, there must be something specific going
on with it.

KWin developers suggested it could have something to do with some additional
subsurfaces preventing direct scanout for example.