Details
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Bug
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Resolution: Done
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P1: Critical
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None
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5.6.0, 5.6.1, 5.7.0 Beta
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None
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X11, XCB plugin
Second screen scaled with: xrandr --output DP-1 --scale 2x2
QT_SCREEN_SCALE_FACTORS=2;2
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fae8ee8b428ae7a406199e504b2d0eedd5059dbd
Description
Whenever I connect a monitor with X automatic downscaling, already-running Qt applications fail to update "devicePixelRatio" and start thus showing in tiny, unreadable fonts.
The screenshot shows tests/manual/qscreen dialog of the second monitor. The procedure was:
- Start qscreen
- Connect the monitor, ensuring 3640x2160 virtual resolution
- Start a second qscreen
To emphasise: the dialog on the left is too small; the one on the right is correct.
As you can see, the properties are different. There's no reasonable explanation for them to be different: they have to be the same. So either there's a bug in updating or there's a bug in getting the properties in the first place.
qtdiag excerpt
Screens: 2, High DPI scaling: active # 0 "eDP-1" Depth: 24 Primary: yes Geometry: 1600x900+0+0 (native: 3200x1800+0+0) Available: 1600x900+0+0 Virtual geometry: 5120x1080+0+0 Available: 5120x1080+0+0 2 virtual siblings Physical size: 294x165 mm Refresh: 59 Hz Power state: 0 Physical DPI: 138.231,138.545 Logical DPI: 108.901,108.857 (native: 217.803,217.714) Subpixel_None High DPI scaling factor: 2 DevicePixelRatio: 2 Pixel density: 3 Primary orientation: 2 Orientation: 2 Native orientation: 0 OrientationUpdateMask: 0 # 1 "DP-1" Depth: 24 Primary: no Geometry: 1920x1080+3200+0 (native: 3840x2160+3200+0) Available: 1920x1080+3200+0 Virtual geometry: 5120x1080+0+0 Available: 5120x1080+0+0 2 virtual siblings Physical size: 598x336 mm Refresh: 60 Hz Power state: 0 Physical DPI: 81.5518,81.6429 Logical DPI: 108.901,108.857 (native: 217.803,217.714) Subpixel_None High DPI scaling factor: 2 DevicePixelRatio: 2 Pixel density: 2 Primary orientation: 2 Orientation: 2 Native orientation: 0 OrientationUpdateMask: 0
xrandr excerpt
Screen 0: minimum 320 x 200, current 7040 x 2160, maximum 8192 x 8192 eDP-1 connected primary 3200x1800+0+0 (normal left inverted right x axis y axis) 294mm x 165mm 3200x1800 59.98*+ [...] DP-1 connected 3840x2160+3200+0 (normal left inverted right x axis y axis) 598mm x 336mm 1920x1080 60.00*+ 50.00 59.94 30.00 24.00 29.97 23.98 [...]
Attachments
Issue Links
- relates to
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QTBUG-53022 HighDPi: Update scale factor setting for devicePixelRatio scaling (AA_EnableHighDpiScaling)
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- Closed
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