https://bugs.freedesktop.org/show_bug.cgi?id=89155
--- Comment #6 from Adam Reichold adam.reichold@t-online.de --- Maybe of interest w.r.t this: Running kernel 4.3.3. by now, I found a seemingly reliable workaround, i.e. if the VGA-connected monitor does not initialize after boot, it will always properly initialize when I put the system into suspend-to-memory and wake it up again immediately after that. (But the VGA-connected monitor will sometimes go dark for a few seconds some time after it initialized for the first time.)