Windows 10: Lenovo C940 BSODs While in Modern Standby

As per the title: When in Modern Standby mode for extended periods, the computer is crashing. I know this from SleepStudy reports I generated. See image below.





This has happened 3 times in the last 4 days (only two of the instances are noted in the image above). The first time was after 1hr in Modern Standby, then again after 14hr, and once again today after 10hr. Notably, as seen in the image above, I tried to use the laptop after it had crashed, restarted, and then gone back to sleep on its own for 7hr, and I could not get the computer to start up again -- it simply wouldn't recognize any trackpad, keyboard, or powerbutton presses. I had to hold the power button for 15 seconds to drain the circuits, then press power again before it would come back on.

I've done the V2 mini dump report and attached for some assistance understanding what's happening.

Please help *Confused Lenovo's tech support are being useless, even though this is a new laptop bought direct from them!

Windows 10 Version 10.0.18363 Build 18363

:)

 

Which Laptops support Modern Standby ?

I called the Microsoft Store, Dell Support and Lenovo sales support.

I asked which systems they had that supported Modern Standby (Consumer or Business Systems).

No one had heard of Modern Standby. The Microsoft Store person didn't even recommend the Surface Pro, which I found out through a PCmag Review, has Modern Standby but Microsoft Sales support did not confirm.

Thanks,

Steve

 

Can't enable Modern Standby

You need an exclusively UEFI PC (without Legacy support) for Modern/Connected, at least it's what I've heard. I guess if that Z390 doesn't have it, I am not really expecting any consumer desktops to implement it, I assume it would require manufacturers to kinda rewrite their BIOS. It is also indirectly suggested on Anandtech that the feature depends on the onboard WiFi:

Personally I love my Ethernet cables and 1Gbit speeds, and WiFi would be the last thing I'd do to my PC, but I would like to test this feature when I buy a new PC, since Z370 is clearly out of question. Considering that Z390 basically has onboard WiFi and Z370 doesn't , it further solidifies this as a potential WiFi only feature. Maybe it's possible for the PC to switch to WiFi for Connected Standby and then back to wire after it wakes up? That would be nice.

Edit: there's also this:
"Modern Standby is only available on some SoC systems. When it's supported, the system does not support S1-S3."

Yeah... S3 is the "normal" standby. So if your firmware manufacturer supports that, it's bye-bye Modern? Ouch.

 

Modern Standby - slow wifi after wake

I have fast internet speeds over wifi when I connect to the network (approx. 600Mbps). If my machine goes to sleep (modern standby enabled) and I wake it up after a while, speed drops from the original speed to a pretty constant 20Mbps. If I disconnect from
wifi and re-connect the speed is back to normal. None of the other machines in my environment show this behaviour, older windows based Lenovo think pad and mac devices have consistently good performance. This is the first windows-based device supporting modern
standby and the only device showing the issue.

Lenovo x1 Carbon 7th gen, with Intel AC-9560, all drivers up to date and firmware current. Have been observing this for a while and several driver iterations now. If I disable modern standby and select linux mode in the bios for standby the speed is normal
after wake up.

I did research lenovo and intel boards and this problem seems to be rooted in windows.