Linux: Screen Tearing FIX in KDE5+
Create a text file in /etc/profile.d
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sudo gedit /etc/profile.d/kwin_triple_buffer.sh
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Write this here:
export KWIN_TRIPLE_BUFFER=1
Next you need to make the script.sh with this lines:
#!/bin/bash
source kwin_triple_buffer.sh && kwin_x11 --replace
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Add it in startup and choose the item "Automatic" in KDE settings.