https://bugs.freedesktop.org/show_bug.cgi?id=98993
--- Comment #3 from Aaron Paden aaronbpaden@gmail.com --- Created attachment 128352 --> https://bugs.freedesktop.org/attachment.cgi?id=128352&action=edit with DRI3 disabled
With DRI3 disabled, I don't get the flashing, but I do get a border around dosbox's framebuffer. This is similar to what you see in Wayland, but it seems more pronounced.
Note that in the no-DRI3 case, it isn't reproducible 100 percent of the time, but its fairly frequent.