Since 5.21 there are glitches or something like that on my screen

Desktop Environments Plasma
7

Have you tried creating creating

/etc/X11/xorg.conf.d/20-intel.conf

Section "Device"
        Identifier  "Intel Graphics"
        Driver      "intel"
        Option      "AccelMethod"  "uxa"
        Option      "DRI" "False"
EndSection

Or

Section "Device"
   Identifier  "Intel Graphics"
   Driver      "intel"
   #Option      "AccelMethod"  "sna"
   Option      "TearFree"    "true" 
   Option      "DRI"    "3" 
EndSection

Edit: https://wiki.archlinux.org/index.php/intel_graphics#Xorg_configuration

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