Expected Behaviour
Stellarium opens in windowed mode on a secondary (non-primary) monitor and renders correctly.
Actual Behaviour
Stellarium displays a blank white screen on the secondary monitor and is unresponsive. The splash screen appears correctly on the primary monitor during startup. Clicking the blank window sometimes causes it to briefly flash black before returning to white.
This occurs regardless of whether windowed or fullscreen mode is used. The only configuration that renders correctly is when the window straddles both monitors simultaneously (e.g. screen_x=1000 with the secondary monitor to the left of the primary), which would suggest that the rendering fails when the window is entirely on the non-primary monitor.
No errors are reported in the log, and the application reports a correct OpenGL viewport size and completes loading successfully, making this a silent failure.
if I try to run Stellarium with QT_OPENGL=angle, it produces the warning QT_OPENGL=angle is no longer supported in Qt 6.
Steps to reproduce
- Fresh install of Stellarium 26.1 on a Windows 11 system with two monitors, where the secondary monitor is not the Windows primary display
- Launch Stellarium and move the window to the secondary monitor
- Save Settings
- Close Stellarium
- Relaunch > blank white screen on secondary monitor
System
- Stellarium version: Stellarium-26.1-qt6-win64.exe
- Operating system: Windows 11 Version 25H2
- Graphics Card: NVIDIA GeForce RTX 3080, driver version 596.36
- Primary monitor: 3440×1440, Windows primary display (right)
- Secondary monitor: 1920×1080 (left, bottom-aligned to primary), screen_number=1 in config
Logfile
log.txt
See attached log.txt. Note the log shows a clean startup with correct viewport dimensions (OpenGL viewport size: 1920 x 1009) and no errors, confirming the failure is silent.
Expected Behaviour
Stellarium opens in windowed mode on a secondary (non-primary) monitor and renders correctly.
Actual Behaviour
Stellarium displays a blank white screen on the secondary monitor and is unresponsive. The splash screen appears correctly on the primary monitor during startup. Clicking the blank window sometimes causes it to briefly flash black before returning to white.
This occurs regardless of whether windowed or fullscreen mode is used. The only configuration that renders correctly is when the window straddles both monitors simultaneously (e.g. screen_x=1000 with the secondary monitor to the left of the primary), which would suggest that the rendering fails when the window is entirely on the non-primary monitor.
No errors are reported in the log, and the application reports a correct OpenGL viewport size and completes loading successfully, making this a silent failure.
if I try to run Stellarium with QT_OPENGL=angle, it produces the warning QT_OPENGL=angle is no longer supported in Qt 6.
Steps to reproduce
System
Logfile
log.txt
See attached log.txt. Note the log shows a clean startup with correct viewport dimensions (OpenGL viewport size: 1920 x 1009) and no errors, confirming the failure is silent.