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I try to handle problems with Linux X-Server with mixed dpi displays.

At the office I would like to use two non HDPI displays, else I like to use the HDPI screen of my XPS13. The best results on the HDPI display I get with changing the dpi settings Xft.dpi

xrdb -merge ~/.Xdefaults

The last remaining problem is that the running applications do not update.

Is there a way to force an update?

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Usually X applications read the resources on startup. So unless an application is especially written for it, you can't force it to re-read the resources while running.

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