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  1. Qt
  2. QTBUG-64051

Qt applications do not adapt to changing DPI scaling factor on Gnome

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Details

    • Bug
    • Resolution: Done
    • P2: Important
    • 5.15
    • 5.9.1
    • QPA: X11/XCB
    • I am on Debian testing amd64, using the distro packages for Qt 5.9.1. My DE is Gnome 2.26.

      I observed the described behavior with Kate and the Quassel client.

      I hope I picked the right components. this was mostly a guess.

    Description

      I am working on a 4K laptop that is regularly connected to a full HD screen (with the internal screen disabled when an external screen is connected(. Every time I (dis)connect the screen, the DPI scaling changes between 100% and 200%. Gtk3 applications adapt to this just fine, but applications written in Qt do not – they keep using the scaling factor they were started with. That is, if I start a Qt application in high DPI mode, it looks way too big when switching to low DPI, and when I start the application in low DPI mode, it looks way too small in high DPI.

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-69136 xwayland: program -geometry uses logical rather than physical coordinates; default window size is wrong (QT_AUTO_SCREEN_SCALE_FACTOR=1)

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Reported

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-68620 DPI setting ignored in 5.11

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Closed
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              sorvig Morten Sørvig
              ralfjung Ralf Jung
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                Created:
                Updated:
                Resolved:

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