Lenovo C940 BSODs While in Modern Standby  

zbook said:

The best tested drivers for the computer's configuration are on the Lenovo website.
These should always be first choice.

Sometimes for computer stability drivers need to be rolled back.

Drivers are typically displayed by date and version.

The most up to date Windows can become corrupt.
In a similar fashion the most up to date driver can become corrupt.

Uninstall: semav6msr64.sys
Sema software

Code:

semav6msr64  semav6msr64            semav6msr64            Kernel        Manual     Running    OK         TRUE        FALSE        12,288            4,096       0          19/07/2019 04:49:03    \??\C:\Windows\system32\drivers\semav6msr64.sys  4,096

Code:

semav6msr64	semav6msr64	\??\c:\windows\system32\drivers\semav6msr64.sys	Kernel Driver	Yes	Manual	Running	OK	Normal	No	Yes

Code:

semav6msr64.sys Thu Jul 18 20:49:03 2019 (5D313DAF)

OKAY, both drivers taken care of -- Lenovo Wifi, and semav6msr64 deleted.
The latter apparently had to do with the Intel Driver Update utility, and a second piece of creepy software it installed to monitor things on the laptop in the background... Anyways, done.

Will report back in a while, after the next BSOD...

- - - Updated - - -

zbook said:

The best tested drivers for the computer's configuration are on the Lenovo website.
These should always be first choice.

Sometimes for computer stability drivers need to be rolled back.

Drivers are typically displayed by date and version.

The most up to date Windows can become corrupt.
In a similar fashion the most up to date driver can become corrupt.

Uninstall: semav6msr64.sys
Sema software

Code:

semav6msr64  semav6msr64            semav6msr64            Kernel        Manual     Running    OK         TRUE        FALSE        12,288            4,096       0          19/07/2019 04:49:03    \??\C:\Windows\system32\drivers\semav6msr64.sys  4,096

Code:

semav6msr64	semav6msr64	\??\c:\windows\system32\drivers\semav6msr64.sys	Kernel Driver	Yes	Manual	Running	OK	Normal	No	Yes

Code:

semav6msr64.sys Thu Jul 18 20:49:03 2019 (5D313DAF)

No crash this evening. However, even with the Lenovo wifi driver, Event Viewer is still showing frequently recurring warnings for Netwtw08 (Event ID 62). I can't find any good online discussions about why this is happening. I just uninstalled the Lenovo wifi driver to check that Netwtw08.sys was deleted, then reintalled the Lenovo driver, confirming that Netwtw08 belongs to the Lenovo version of the wifi driver.

- - - Updated - - -

Nothing overnight. Just lots more errors and warnings in the Event Viewer while the computer should be asleep.

I'm spending lots of time on this, and I can't send the computer off until the second half of February, so I'm considering a total reformat of the drive and fresh Windows 10 1909 install... I already did a Repair install a couple weeks ago. That only resolved the problem for about a week.

Any thoughts on giving in to this reformat route, based on what you've seen from the logs? Likely pointless? Are you more optimistic?

Generally windows driver is used for approximately 48 hours to find misbehaving drivers.
And then for an additional 36 hours after the last BSOD.

It sometimes takes time to distinguish software from hardware problems.
If you plan to clean install that is another option.

For Windows driver verifier you can increase the number of simultaneous customized tests up to the 19 in this link:
https://answers.microsoft.com/en-us/...3-c48669e4c983

If there is freezing or slow boots you can modify the customized tests so that all of the non-Microsoft drivers are exposed to the 19 tests.

Okay, well.. Given the time I have before I can hand over to Lenovo, I'll do the fresh install in the short term, and report back, starting from the driver verifier instruction again, if the problems will continue.

I really do appreciate the help so far, so if I'm away for a week, waiting on new bsod records, I hope you'll be back :) Cheers

zbook said:

Generally windows driver is used for approximately 48 hours to find misbehaving drivers.
And then for an additional 36 hours after the last BSOD.

It sometimes takes time to distinguish software from hardware problems.
If you plan to clean install that is another option.

For Windows driver verifier you can increase the number of simultaneous customized tests up to the 19 in this link:
https://answers.microsoft.com/en-us/...3-c48669e4c983

If there is freezing or slow boots you can modify the customized tests so that all of the non-Microsoft drivers are exposed to the 19 tests.

The whole thing went sour TWICE.

I reinstalled fresh, twice...

The first time, I used Windows 10 1909 downloaded direct from Microsoft. It barely had any compatible drivers, and that was a nightmare to get everything up and running again. Ultimately, I couldn't get the fingerprint reader to consistently work (it worked for a bit; long enough that I could enroll my fingerprints, but stopped a couple hours later), or the webcam. I uninstalled and reinstalled drivers for both multiple times.

Then I got access to the Windows 10 install from Lenovo, built explicitly for the C940. Most drivers were there, but I was still having the fingerprint reader and webcam issues. Running the Lenovo hardwre diagnostics tool, the output for both shows they're not recognised. But Device Manager reinstalls both of their drivers after I uninstall, if I ask it to scan for hardware changes...

After the second fresh reinstall of Windows 10, I've started strongly pursuing the UK Lenovo retailer company for a refund/exchange, and the credit card company (UK credit card companies have equal responsibility as the retailer, to refund). But would still love to find out this is all just a fixable problem...

Also after the second reinstall, the only observed problem for a couple days was the fingerprint reader and webcam. But then I put it to sleep 27 hours ago ("Modern Standby") and came back to it today, and it drained 79% of the battery. I've included a series of incredibly ocncerning sleep study images below, and I've re-done a V2 report (Attached). Care to have a look?

Attachment 265028Attachment 265029Attachment 265030Attachment 265031

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