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I'm struggling to set default value of QT_AUTO_SCREEN_SCALE_FACTOR in my system (debian bullseye). But it seems that value I put a setter into .profile is ignored. Anyway the environment variale is set but its vaule is zero. I searched my .profile, .xsessionrc, and the whole /etc for it and didn't find anything. So my question is who sets the default value of QT_AUTO_SCREEN_SCALE_FACTOR and how to alter this value for good?

ardabro
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1 Answers1

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I came up with exactly the same question (debian sid) today and found the culprit. It is the application startplasma-x11 itself.

You can check it yourself by downloading the source of plasma-workspace. In startplasma.cpp of version 5.27.2 starting at line 335 you will find:

    qputenv("QT_AUTO_SCREEN_SCALE_FACTOR", "0");

qputenv("KDE_FULL_SESSION", "true");
qputenv("KDE_SESSION_VERSION", "5");
qputenv("KDE_SESSION_UID", QByteArray::number(getuid()));
qputenv("XDG_CURRENT_DESKTOP", "KDE");

qputenv("KDE_APPLICATIONS_AS_SCOPE", "1");

I think i will remove this line and compile it myself to be able to set this variable via .profile or ...

Nevertheless, this would not be the final solution as on upgrade it would need a recompile.

voc
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  • I resorted to setting it with env individually for some apps shortcuts; anyway - HiDpi support in linux sucks awfully – ardabro Mar 06 '23 at 22:34