Right-click the application, select Properties, select the Compatibility tab, and then select the Disable display scaling on high DPI settings check box. Select Display > Change the size of text, apps, and other items, and then adjust the slider for each monitor. The effect of this setting on our Qt app is that all text becomes unreadably small: It can be reproduced on any system by running xrandr - dpi 32.5 before starting the application. At least one of these projectors reports a physical size of over one metre, which results in only 32.5 dpi reported to the Linux OS (compared to the default of 96 dpi).
I know that on Windows at least, if you have a NVIDIA or AMD video card, it is possible to set a virtual resolution that is higher than your monitor, and will then be scaled down. Depending on your video card and/or OS, a high DPI monitor is not necessarily required to test DPI issues. On a very high DPI device, 14 pixels would be very tiny, and on a lower DPI device, it might look how you want.
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However, due to extremely different screen resolutions from a high end Android device to a low end Windows monitor, 14 pixels will look much different. Basically, the issue is that most UI elements in QML are defined in raw pixels. This feature can be enabled or disabled with a environment variable called QT_AUTO_SCREEN_ SCALE_FACTOR which is set by some of the desktop desktop environments on some of the distributions. Qt 4.15+ supports automatic high DPI scaling. qtdiag is saying that my monitor is on High Dpi scaling but I don't understand why and how I. Also I do not understand how or why the problem raised in the first place. I really do not know how I can make it reset.
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Here is a minimal example code for the instanciation of the QApplication to force High DPI, choose other value than 1 (0 or 2) to enable DPIUnaware or Per. According to the documentation, you can set the application to DPI Unaware (thus it will automatically scale but display will be blurred), or to System DPI Aware or to Per-Monitor Aware. You can see exactly the same two problems on any X.
It’s not a problem with the great high DPI work Marco’s done all over mutter for Wayland, but it is a problem with using Xrandr. Unfortunately those seem to be a consequence of using Xrandr transforms. (Like VLC) 2, screen tearing when dragging windows. An example call might look like this: case WM_NCCREATE. This function must be called from WM_NCCREATE during the initialization of a new window. Calling this function enables non-client scaling for top-level windows only.