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Real-Time Clock Power Loss (005) on HP ProDesk 600 G2


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With Windows 10 or 11 only setup it works perfect, never show any such error. Haven't tried dual boot.

 

Now on Big Sur, it shows 'Real-Time Clock Power Loss (005)' error on boot. Usually it doesn't  show this error on first boot after overnight power off.

 

Already tried 

DisableRtcChecksum

and 

rtcfx_exclude=00-FF

with RTCMemoryFixup.kext

 

Then I tried SSDT-AWAC.aml and SSDT-RTC0-RANGE-HEDT.aml, but is still the same.

Have you tried the registry edit for windows? RealTimeIsUniversal or something like that.


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2 hours ago, SavageAUS said:

Have you tried the registry edit for windows? RealTimeIsUniversal or something like that.

 

Not on dual boot, just Big Sur. On Windows it works perfect. Checked it with Windows 10 and Windows 11 only setup, no issue at all, it boots every single time without any error.

It's an RTC-related error, not a clock (as in time of the day) matter. If you Google for that error message, you'll find a few existing links to other forums where this was discussed and an RTC patch (ACPI patch) provided.

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