[Bug 86000] 2-3 second black screen on MacBook Pro 11,1 (13" retina)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86000

--- Comment #2 from samcurry <haskell.curry1909 at gmail.com> ---
Hm, this is interesting. I spent all day at work, and it seemed to work fine.
Now, I'm at home, and it's started playing up within about 20 minutes...

Differences:
- playing music through USB audio interface (also have a different one at work,
although today I didn't touch it)
- on battery power (although I'm pretty sure this has happened on AC too)
- different WiFi network (this has previously happened at work, though)

Seems the USB interface is perhaps most likely to be causing interference?
Although, I've had this behaviour without it plugged in, too... Though maybe
having used it once then unplugging it again might trigger whatever it is that
goes wrong? How could I investigate this?

Another note: I have enabled a few of powertop's suggestions, such as
autosuspend for certain USB devices... I will try disabling them again.
Attaching another updated dmesg too.

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