A fun one I once had. I had a monitor early on in the MST days, a Dell UP2414Q. It had a fun firmware bug, where any time it changed resolution while using MST

A fun one I once had. I had a monitor early on in the MST days, a Dell UP2414Q. It had a fun firmware bug, where any time it changed resolution while using MST, there was a chance the monitor would crash or do one of several very strange failure modes. In particular, it would sometimes do what I would describe as "crashing" (go black and require physical power cycling to come back), or become confused on what I assume was the state of one of the two "streams" in MST - that is, the left or right "half" of the display would be incorrectly displayed, either by being entirely black, or as though it thought that "half" should be scaled to the entire width of the display, but only for that half. e.g. if we think of the left side as 0-50 and the right as 51-100, sometimes it would only display 0-50's content in 0-50, sometimes it would show 0-50 and the content that should have been 76-100 scaled to the width of 51-100 (e.g. it scaled the right "half" as though it were intended to be the full span of the screen, and then only displayed the portion that would have been visible). My best guess about how that could happen was that the decoding for the two sections was handled independently and there were synchronization bugs. Apparently there's an A01 rev of the monitor that does not suffer from these, but Dell says the FW isn't upgradable, so I ended up trading it to someone else (with full disclosure of the reason I was getting rid of it, ofc).