[Bug 54279] New: Wine 8.0x breaks window mode games on hidpi monitor Wayland

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=54279

Bug ID: 54279
           Summary: Wine 8.0x breaks window mode games on hidpi monitor
                    Wayland
           Product: Wine
           Version: 8.0-rc3
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

I play window mode games on Wine 7.x Wayland + HiDPI 4K monitor and it works
fine. Although the window is bitmap upscaled, the window size is normal and I
can still play the game.

After upgrading to Wine 8.x, on Wayland+HiDPI when I run the game in window
mode, the window becomes very small and is unplay-able. It is also impossible
to adjust the window size.

I noticed there are some changes on HiDPI+Wayland in Wine 8.x, is it possible
to configure Wine 8.x to keep the old behavior? For example, is it because now
Wine handles the application scaling, not Compositor? If so, how to revert the
old behavior to let compositor handle the scaling?

[Bug 54279] Wine 8.0x breaks window mode games on hidpi monitor Wayland

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=54279

--- Comment #1 from Xu Zhao  ---
Created attachment 73845
  --> https://bugs.winehq.org/attachment.cgi?id=73845
The game window is too small and unplayable.

[Bug 54279] Wine 8.0x breaks window mode games on hidpi monitor Wayland

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=54279

Zhiyi Zhang  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[e-mail]

--- Comment #2 from Zhiyi Zhang  ---
Could you do a bisect? Please see https://wiki.winehq.org/Regression_Testing

[Bug 54279] Wine 8.0x breaks window mode games on hidpi monitor Wayland

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=54279

Neko-san  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[e-mail]

[Bug 54279] Wine 8.0x breaks window mode games on hidpi monitor Wayland

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=54279

--- Comment #3 from Xu Zhao  ---
(In reply to Zhiyi Zhang from comment #2)
> Could you do a bisect? Please see https://wiki.winehq.org/Regression_Testing

Thanks for replying.
This is actually not an error of Wine. It is because Kwin changed its configs.

Kwin introduced a new option in kscreen:

"Legacy Applications (X11)" scaling can be "Apply scaling themselves" or
"Scaled by the system".

If I choose "Scaled by the system", the windowed game runs fine.
If I choose "Apply scaling themselves" (which is the default one after kwin
upgrade), the Wine window becomes very small on 4K screen KWin Wayland.