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Looking at this in more detail, it showed, that XFCE and LXDE-desktops are not affected, but it is not a GTK3-exclusive problem, but besides Cinnamon it also shows with the E17-desktop and also with KDE-Plasma-Desktop, but it looks different there. So the best guess is, that this is the RADEON-driver's fault and i486-32-bit systems may also be affected, because i tried only XFCE and LXDE there, I am not checking this out in more detail, because I am not interested in using this option personally. DVI-output is turned off already, when lightdm would appear, when no analog VGA-monitor is connected, while the other graphics-problems show only upon login. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iEYEARECAAYFAlRpxJAACgkQ5+rBHyUt5wttoQCgj2W86IYrJv3mmJwrloj/7HZ+ TgIAnRTMwmzbW7SZTviyfHmnhhBLCV8z =Htq5 -----END PGP SIGNATURE-----