I have continued to have my random screen blacking issue (would not wake up sometimes for minutes, sometimes for hours, sometimes for days! and would sometimes just go dark in middle of the drive). Weird because it would go for a month or more working fine and then start acting up. After a software update it would tend to work fine for several weeks but then start its nonsense all over again.
So Tesla replaced the computer yesterday so hopefully this will permanently resolve the issue. As always, service center was efficient and courteous even if I did get "stuck" with a Model S for a day.
Long story, but my screen has been going black for past several days. Stays black for hours (from 12 to 36 hours) then randomly comes back on after sitting for a few hours or overnight only to go black again after being parked for awhile. Numerous reboots and a call to Tesla roadside did no good. It is scheduled into service center for next Monday (ugh). BTW everything else works - even EAP - just no screen. I am running software rev 50.6 since December.
When this broke I was staying out of town (100+ miles from home) for the weekend so no way to deal with a tow. The situation forced me to drive for most of 4 days (including a 110 mile trip home) with no screen.
I ended up opening the app on my iPhone and using it to make the drive home. It gave me more-or-less real-time speed information (1-2 second delay) plus state of charge information and the ability to control the climate. Not ideal, but it worked okay in a pinch to keep me from going too fast (especially important since I was mostly driving a rural road in East Texas with speed limits that vary from 75 to 35 and I really had no desire to get caught in one of the many speed traps out there). I was also glad to have the SOC information since I was pushing the range envelope after 260 miles on the road over four days and only one evening access to a 115V charge (turned out I had plenty of juice but driving blind would have been very unnerving).
Anyway thought it would be a useful tip if anyone else finds themselves in the same situation. And, BTW Tesla, you guys should think about a screen mirroring app connected via the USB to give us a backup!