Surface Pro 4 - Screen won't wake from sleep

I have also been getting the freeze issue. I returned my original SP4 and received a brand new lot 1621 SP4. It still had the sleep issue so I switched off sleep and used hibernate instead. It was working perfectly until recently it started freezing pretty much every time I leave it idling on battery. No problem when plugged in. I contacted MS who said just to return it which I'm reluctant to do since I've put a very nice skin on this one. I'll try your USB Root Hub solution, though I have no idea what it is yet. Gonna be doing a lot more reading. One thing's for sure though, this forum is more helpful than any MS rep I've spoken to, so I'm glad to have found you guys.

I just reset my machine and it was working absolutely fine, no crashes. No sleep problem for the few hours I was using it. Then windows 10 updated to the latest 1511 version and the crashes started all over again (when on battery). Looks like the problem is related to the latest windows 10 builds

Update: switched off USB root hub power management in device manager and this has resolved all my issues. Thanks guys!

Well having suffered with this like so many here since late last year I'm 99.9+% certain this has now been resolved with the anniversary update.

I tested this with USB root back to the default with power saving on after Windows Update with various sleep lengths up to the 2 hours default hibernation mark and worked fine.

I then wiped the SP4 with a clean install with the Media Creation Tool and blitz all partitions. Then again, tested it with no apps installed up to the 2 hour Hibernation mark. Then again with all the Store and Win32 Apps installed and still worked flawlessly. Finally installed my Norton Security Package and tested again and still working good. Battery drain is also very good looking at SleepStudy.

One thing I have noticed is whenever it wakes, it makes a "USB plug-in" sound which it never used to. So it makes me wonder how the USB Root workaround might have been involved someone (like someone already pointed out before the update) and if something has been changed at the core which simply couldn't be fixed previously with driver updates?. I never believed this was a hardware issue because a few (admittedly not many) higher LOT users reported having the sleep of death issue.

Just glad it finally fixed !

I and many others been pretty harsh on Microsoft in this forum over the past several months - and they really had every bit of it coming.  I still think Microsoft's refusal to acknowledge the problem and keep us updated on their attempts to fix such a severe known problem is just inexcusable.

That said, my experience so far with my SP4 after the flurry of updates over the past few weeks and also this week's Anniversary Update (Redstone) is one of vast improvement.

I've only had one failure of any kind since the AU: actually, it woke fine, but then Windows Hello wouldn't run, and it also wouldn't allow me to choose PIN or Password as an alternative, so I was forced to do the time-honored forced Poweroff/Startup again.  (There seem to still be problems with the USB power system - my SP4 fails to go to sleep when plugged in (I've told it not to in settings), even when I manually invoke sleep - the USB lights on my Wacom digitizer pad flash madly as the USB connection is started and stopped, and so it never enters sleep.  This is definitely a bug, but admittedly a bit of a corner case.)

For the first time, I feel like I've got something approaching the Surface Pro 4 I bargained for, and that Microsoft advertised. It sleeps and wakes, it no longer loses the ability to run Modern (UWP) apps (Start Menu, Cortana, Action Center, etc.) several times a day, and in general, I'm starting to think I could actually count on it working.

I'm still quite distressed that I've wasted so much of the last two years trying to get everything to work, but I applaud Microsoft's tech team on finally (I hope) getting this right, and making things work (at least nearly) as they should.

The Anniversary Update is a real improvement, too - the Start Menu is nicer; Windows Ink finally lets apps take advantage of the great power of the pen; Cortana works better; audio support is much improved (although my bluetooth speakers can become disconnected after waking, which also requires a reboot); the seams between the old desktop and new UWP halves of the OS are less noticeable; and as an old Unix user recently back into software development, having the Ubuntu Linux on Windows stuff is just the greatest thing ever - it really is the best of Windows combined with the best of Linux/Unix.

So my preliminary assessment is, "Job well done, and it's about time!  Now keep on going - you're not done yet."(I'm reserving final judgment for another week or two, but so far, color me happily impressed, quite optimistic, and finally not regretting buying into the Surface Pro 3 and 4 ecosystem.)

I might even be really interested in that rumored Surface Phone when it gets here, if MS can continue to improve reliability to the "rock solid" level.  ;-) Seriously, thanks to the entire (no doubt quite extended) team for the long overdue results.  Now if we could just work on that customer communications thing... (Not really angling for a job, but I happen to be available at the moment, and once owned responsibility for all software and firmware on portables at Dell.)