QT5 screen scale factor

In my previous post, I described the problem of having too large interface buttons, search fields, scroll bars, etc of Calibre (compiled against QT5). I found a fix of Calibre, however, it seems this problem occurs for other QT5 programs. For example, I installed AlienBob’s VLC package, version 3.0.4 on Slackware64 14.2 and noticed the same issue. So, a more general solution should be found.
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Video driver in the initrd.gz

I have an ATI Radeon HD 6450 card. Sometimes upon boot, just when the console should switch to the screen native resolution, it apparently fails to do so. The screen goes black and the computer restarts. Read the rest of this entry »