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[jason]

mpv, mplayer, vlc, and OpenGL applicaitons like Kodi.  Fury Nano.

Erratic flickering, usually when an OpenGL application is started on the non primary monitor or moved between  nonprimary and primary.  Entire frames will not be filled in occasionally as if it was just dropped from the render queue for up to maybe 4 or 5 frames.

Non OpenGL backends not having as many problems.

I've also occupationally noticed massive slowdown unrecoverable screen corruption when unplugging / plugging back in a monitor when I was finalizing my setup.  These likely have different but related origins but geh,  the driver needs more polishing on robust/recovery.

[jason]

to clarify, by not rendering I mean it's the same as if the window were transparent.  The window decorations are still around though.

[jason]

one more note, seems to do it alot more when an application is re-sized.  I've gotten lucky many times when telling the application to start full-sized.  I've also noted that previous window contents are often used in flickering, when it's not transparent or black.