https://bugzilla.kernel.org/show_bug.cgi?id=83331
--- Comment #6 from Alex Deucher alexdeucher@gmail.com --- Is your kernel log any different when you experience the long delays? There is a 5 second time out for certain display related atombios settings, but when that happens you'll get a message in the kernel about that. If you don't see anything in the kernel logs, you'll probably have to add some debugging messages to see where the delay is happening.