https://bugs.freedesktop.org/show_bug.cgi?id=98020
--- Comment #3 from Andy Furniss adf.lists@gmail.com --- (In reply to Michel Dänzer from comment #2)
Comment on attachment 126960 [details] [review] undo page_flip ioctl damage
Please test https://patchwork.freedesktop.org/patch/113365/ instead.
That fixes it, thanks.