[Bug 60557] New: Ubisoft Connect starts with a blank window on X11

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=60557

            Bug ID: 60557
           Summary: Ubisoft Connect starts with a blank window on X11
           Product: Wine
           Version: 11.0-rc3
          Hardware: x86-64
               URL: https://www.ubisoft.com/en-us/ubisoft-connect
                OS: Linux
            Status: NEW
          Keywords: download, regression
          Severity: normal
          Priority: P2
         Component: winex11.drv
          Assignee: [e-mail]
          Reporter: [e-mail]
                CC: [e-mail]
  Target Milestone: ---
   Regression SHA1: 83270eb2bb01a84310707e9feb01c071ee1d9a93
      Distribution: ArchLinux

Created attachment 82423
  --> http://bugs.winehq.org/attachment.cgi?id=82423
plain terminal output (WINEDEBUG=fixme-dxgi,fixme-d3d11)

Ubisoft Connect starts with a persistent white window instead of displaying its
login screen. The client continues running. Grabbing the apparent title-bar
area or slightly resizing the window can make the interface appear immediately.

Disabling libglesv2.dll (bug #44985) restores the interface but causes
continuous CPU usage of approximately 100% while the client is idle.
I passed the following command line switches to the upc.exe but none of them
fixed the problem:
--use-angle=gl
--disable-direct-composition
--disable-gpu-compositing
--disable-gpu
--in-process-gpu

The regression was bisected between Wine 11.0-rc2 and 11.0-rc3 to:
83270eb2bb01a84310707e9feb01c071ee1d9a93
winex11: Avoid creating window data entirely for offscreen windows.

Reverting this commit applies cleanly to Wine 11.20 and restores automatic
display of the login screen on X11. The window may initially remain white for
approximately two seconds before the interface appears without any mouse
interaction.

Window geometry:
================
Maximization is not required to reproduce the problem. The client stores its
window settings in %LOCALAPPDATA%\Ubisoft Game Launcher\settings.yaml

On my 1440×900 display the initial settings are:

position:
  height: 859
  left: 0
  maximized: false
  top: 0
  width: 1440

The 859-pixel height leaves room for my always-visible Xfce panel at the
bottom. This is a work-area-sized window rather than a confirmed fullscreen
state.

With the client completely closed I also tested:
position:
  height: 700
  left: 0
  maximized: false
  top: 0
  width: 1000

The client still starts with a white window at the requested 1000×700 size.
Simply grabbing its apparent title-bar area makes the login screen appear.
This workaround is less accessible when the Xfce panel is hidden and the client
fills the entire 1440×900 display. In that state I cannot resize the window
even when the pointer changes to a resize cursor. Double-clicking the apparent
title bar does not restore the interface either.

An Ubisoft account is not required to reproduce this issue. The failure occurs
before signing in.
Download: https://www.ubisoft.com/en-us/ubisoft-connect
Click “Download Ubisoft Connect” at the top of the page.
UbisoftConnectInstaller.exe (252 MiB)
sha256: 3cec13adb297daf861528ca59c94467d9aee4b43b0089ebc211cf5de16618503

Ubisoft Connect version: 174.2.13389 (built October 8, 2026)
Bundled CEF version, extracted from libcef.dll:
135.0.20+ge7de5c3+chromium-135.0.7049.85
CEF: 135.0.20+ge7de5c3
Chromium: 135.0.7049.85

Steps to reproduce:
1. Install Ubisoft Connect.
2. Leave libglesv2.dll enabled and Wine's “Allow the window manager to control
the windows” option enabled.
3. Start the client with `wine UbisoftConnect.exe` without additional
command-line arguments.
4. Observe that the login window remains white.
5. Click and hold the apparent title-bar area at the top of the white window,
or slightly resize the window. The login interface may then appear immediately.
This workaround doesn't seem to work when the client's window occupies the
whole desktop area. Using Wine's virtual desktop mode is a more reliable way to
make this workaround work.

wine-11.20-20-g840a939ee52
Arch Linux
X11 / Xfce / Xfwm 4.20.0
NVIDIA GeForce GTX 1660 SUPER / driver NVIDIA 615.78.08
Reproduced with both legacy WoW64 and the new WoW64 mode
Reproduced in normal desktop mode and Wine virtual desktop mode
Reproduced with Wine's built-in graphics DLLs and with DXVK

I also reproduced a white window under KDE Plasma with XWayland. Native Wine
Wayland has a blank-window problem too, but that also occurs with Wine 10.0 and
the parent of the bisected commit. Reverting the commit does not resolve native
Wayland.
Bug #44985 describes similar symptoms and the same libglesv2.dll workaround.
This report concerns the X11 regression identified by the bisect and confirmed
by reverting the commit.

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