My laptop is hp spectre x360 13 and my OS is Ubuntu 18.04.4 LTS. I want to use a Java-based application called paraprof(here). Sorry, I don't use Java so I put part of its description below (don't know whether it helps):

ParaProf requires Oracle / Sun's Java 1.5 Runtime Environment for basic functionality.
Java JOGL (included) is required for 3d visualization and image export. Additionally,
OpenGL is required for 3d visualization.

The problem is when I launch it the font size is too small to read:

I think this is a scaling problem on high DPI display? The built-in display of my laptop is 3840 * 2160, and in setting - screen display section I set the Scale option as 300%.

I encounter a similar scaling problem before, the font size of spotify is also really small. I solved this one by adding alias spotify="/snap/bin/spotify --force-device-scale-factor=3.5" in my bashrc file. I wonder if there is similar solution to this one.

I see some people suggest to use -Dsun.java2d.uiScale=2.0 here, but I am not sure how to use this.

1 Answer

I find an answer there: solution

So this one is to use a script acts as the front end of xpra. It can perform a scaling to the specific applicaiton you required.

// install some dependencies
sudo apt-get install xpra winswitch xvfb
// install it
curl "" > ~/.local/bin/run_scaled
chmod +x ~/.local/bin/run_scaled
// then you can run your app
run_scaled someapp

Although this one works fine, I wonther if there is other way to achieve the scaling problem.

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