i experimented with the vblank_mode in various applications and saw that it limits the fps to 60 hz as my monitor is but the picture is torn apart.
Yes, in order to avoid tearing, you either need to run the (OpenGL) application in fullscreen with page flipping enabled, or you need to use a compositing manager which does the same thing. When using a compositing manager, enabling DRI3 may help.
running fullscreen nor changing any of the compositing options of my kubuntu kde did make a difference. i really tried but could not find any way to fix this so i thought it might be a bug.
Without DRI3, you need to choose "Full scene repaints" in the kwin desktop effects advanced settings for "Tearing Prevention (VSync)". With DRI3, you can choose "Re-use screen content", which is more efficient. You probably also want to enable "Suspend desktop effects for fullscreen windows".
If none of that helps, please attach your Xorg.0.log file.
Oh, you also need to select OpenGL for compositing in kwin. Also, with current xf86-video-ati Git, you can try Option "TearFree".
ok. thanks for the tips, it works now. i set the kwin compositor to: (option names may differ, i have a german machine) -scaling: precise -opengl instead of xrender -glx not egl -vsync to automatic -window thumbnails: only visible windows -compositor not deactivated in fullscreen -no color correction
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