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  1. Qt
  2. QTBUG-102758

Application always starts on wrong screen

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P1: Critical
    • Resolution: Done
    • Affects Version/s: 6.3.0
    • Fix Version/s: 6.3.1, 6.4.0 Beta1
    • Component/s: QPA: X11/XCB
    • Labels:
      None
    • Environment:
      Arch Linux x64, Qt SDK gcc_64, nvidia 470.42, two monitors w/o Xinerama
    • Platform/s:
      Linux/X11
    • Commits:
      731b38e768 (qt/qtbase/dev) 731b38e768 (qt/tqtc-qtbase/dev) 13fa48bdc7 (qt/qtbase/6.3) 13fa48bdc7 (qt/tqtc-qtbase/6.3) 13fa48bdc7 (qt/qtbase/6.3.1)

      Description

      I have two separate X screens that are not using Xinerama, each screen is on a separate Nvidia GPU, using the proprietary driver:

      $ DISPLAY=:0.0 xrandr --listmonitors
      Monitors: 1
       0: +*DP-0 2560/600x1440/340+0+0  DP-0
      $ DISPLAY=:0.1 xrandr --listmonitors
      Monitors: 1
       0: +*DVI-D-0 1920/620x1080/340+0+0  DVI-D-0
      

      nvidia-settings shows Screen 0 on the left side and Screen 1 on the right: nvidia-settings

      However, Qt 6.3.0 thinks the left display, DP-0, is NOT the primary screen, but 6.2.2 correctly shows it as the primary:

      $ ~/Qt6/6.2.2/gcc_64/bin/qtdiag | grep 'Primary:'
      # 0 "DP-0" Depth: 24 Primary: yes
      # 1 "DVI-D-0" Depth: 24 Primary: no
      
      $ ~/Qt6/6.3.0/gcc_64/bin/qtdiag | grep 'Primary:'
      # 0 "DVI-D-0" Depth: 24 Primary: yes
      # 1 "DP-0" Depth: 24 Primary: no
      

      This looks like a regression to me. This causes the application to always start on Screen 1 (the right side screen), even though I am launching it from Screen 0 with the correct DISPLAY value of :0.0 (not :0.1).

      Since I am not using Xinerama, windows cannot be freely moved between screens, and I cannot figure out a way to get my application to start or display at all on the correct monitor, which shouldn't be necessary anyways.

        Attachments

        1. application.diff
          0.5 kB
        2. screenlog.0.txt
          115 kB
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            People

            Assignee:
            liaqi Liang Qi
            Reporter:
            bparker Brad Parker
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              Dates

              Created:
              Updated:
              Resolved:

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