[8.52a] Incorrect system uptime value @ System info dialog

[Bluestar]

Hi,

I already noticed it before, that sometimes the System Information dialog of TC reports some pretty large value in the "time since win start" field, but I thought maybe it was really just me who forgot to turn off the notebook (although I turn it off almost everytime @ night).

Now I am sure that I turned it off 2 days ago, but still TC reports incorrect runtime value. Picture attached, AIDA64 reports correct information.

Maybe something has changed in Win10 that affects the runtime calculation module?

TC (incorrect)
Image: http://s30.postimg.org/5wbnp1d8h/tc_runtime.png

AIDA64 (correct)
Image: http://s15.postimg.org/ko3xa1eqj/aida_runtime.png


SW info: Win10 ver1511 b10586.164, TC 8.52a(x64), Hungarian locale, AIDA64 5.70.3800

[umbra]

In Windows 8, Microsoft has changed meaning of "Shut down". It puts your PC into a special kind of hibernation instead of actually shutting down everything. The reason is to make it look like the Windows 8 boots faster than Windows 7.
Only "Restart" actually turns everything off to allow us install Windows updates modifying kernel.

I guess TC uses an API that is not reset during this "Shut down", only during "Restart".

EDIT:
After a quick check of API, it looks like MS doesn't directly provide last power up time. Even Win32_OperatingSystem.LastBootUpTime shows time of last full restart.

Since TaskManager shows the same thing, is this an error or actually an intended behavior?

umbra

[ghisler(Author)]

TC is using the GetTickCount() function, which is the time since the last reboot. It has a maximum of 49.7 days until it wraps around to 0. However, since monthly Windows updates require a reboot, this shouldn't be a problem.

[Lefteous]

https://msdn.microsoft.com/de-de/library/windows/desktop/ms724411%28v=vs.85%29.aspx

[j7n]

AIDA64 can report uptimes more than a hundred days (on XP). It says it relies on the Event Log.

[ghisler(Author)]

I'm aware of GetTickCount64, but that wasn't the question here. It will have the same effect as the thread starter reported (putting PC to sleep doesn't count as fresh start).