Comment # 3 on bug 98993 from Aaron Paden

Created attachment 128352 [details]
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.