Surface Pro 4 - Screen won't wake from sleep

Thanks! I'll give it a try if the black screen coming out of hibernation happens again.

It appears that the latest Microsoft Updates today (2015-01-12) has had a positive impact on many things. It's very early but so far things have been much better connected to the new docking station with 11-20 .4326 Microsoft drivers vs 12-15 .4352 Intel drivers.

On Intel sourced .4352 drivers new corded docking station before latest Windows Updates SP4 would disconnect about every 10-15 minutes momentarily then switch back to external single 4K monitor but I'd have no mouse or keyboard. So I'd disconnect docking cable and reconnect.

Before using Intel .4352 drivers I'd have a similar but less frequent experience but I'd loose docking station wired Ethernet adapter every 10ish minutes.

So I've installed latest update, including .63 and rolled back to latest Microsoft display drivers (.4326) the docking station issues have so far not occurred! I'm overjoyed.

I'll do more testing over the next several days - hopefully the black screen issue is a thing of the past too, even with November drivers.

You can just tap power and volume up button for CtrlAltDel when you don't have a keyboard.

CtrlAltDelete does not fix the black screen issue. What you describe is having slideshow turned on for lock screen, system goes to sleep while plugged in. With this CtrlAltDel does work "everytime." Unfortunately, pressing CtrlAltDel does not fix the black screen issue coming out of hibernate.

My associate has done extensive testing with all the new features of Windows 8 and 10 as it relates to the new screen saver, slideshow and spotlight settings for settings/personalization/lock screen non-domain and domain joined computers with various group policy settings. CtrlAltDel does bring back the ability to fully interact with the computer and fully displaying everything. Without CtrlAltDel you can still see mouse movement but nothing else, only CtrlAltDel would bring back the screen (and ability to fully interact with the computer).

Starting with 4th generation devices, like Surface Pro 3 (Haswell era) there is a new CPU state that has never existed on Intel based computing system - at one time called connected standby - much like a cell phone with the screen off but not powered down. It's a low power state that still kept network alive and cpu still on but in a minimal way. Think of it as mostly off but not totally off.

My hunch is that there's some bugs in the new 6th generation Intel chipset, cpu an/or gpu. I'd be really curious if other hardware with 6th gen. Intel hardware has similar issues coming out of hibernation. Unfortunately we only over see about 220 PCs and don't have any other 6th Gen. devices to test/use yet.

For those without a keyboard, you can do CtrlAltDel without a keyboard - simultaneously press and release power and volume up, that triggers CtrlAltDel.

I have had the same problem with my surface pro4 numerous times since I purchased it 2 months ago. the last time it took a day to get it to turn on, lucky I have my trusty sony with me as I am in a remote location for one month at a time. I contacted (chatted) with Microsoft support and opted to go with the replacement which I was told would take 3-5 business. After 5 chats and 3 phone calls and nothing but lip service saying it's on it's way, still no replacement. I finally got an email today saying it's been shipped, 27 days later. Now problem is I'm not home for at least 2 weeks and may not be able to return defective laptop on time.  The Microsoft service I received is terrible.

I also was thinking of getting the Lumina 950 but now convinced not to.