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Level 2
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Flag Post
HP Recommended
ZBook 15u G6 6TP55EA#ABU
Microsoft Windows 10 (64-bit)

Laptop regularly self-hibernates after a thermal event. Problem started following an upgrade to the latest BIOS on the 10/10/2019. Problem occurs after almost exactly 2 hours, with a few extra occurences over shorter periods. The problem occurs when the machine is under extremely light load, typically with the CPU cores running at less than 40C.

Windows Event Log show:

The system was hibernated due to a critical thermal event.
Hibernate Time = ‎2019‎-‎10‎-‎20T17:36:09.261312500Z             
ACPI Thermal Zone = \_SB.PCI0.LPCB.EC0.HEPZ             
_HOT = 353K

 Timings from last power up event until thermal event:

10/10/19 - 01:59:51 03:13:19
11/10/19 - 02:00:59 00:50:09 00:42:01
14/10/19 - 00:02:50 00:34:52 01:04:09
15/10/19 - 02:00:57 00:04:03
16/10/19 - 01:07:00 00:22:08
17/10/19 - 02:00:55 02:00:58
18/10/19 - 02:00:57 00:54:00 02:00:58
19/10/19 - 02:00:56
20/10/19 - 02:00:57 02:00:58

The 2 hour mark cannot be a coincidence, as this has occurred 10 times give or take 60 seconds!

Using a CPU core monitor utility, it does indeed appear to get a high temperature reading on multiple cores, but only momentarily, and the fan does not cut in as it would when the machine is under load, leading me to believe this is a false reading.

The system resumes without problem, so no data is lost, but it is extemely annoying.

The following software was installed on the 10/10/19, coinciding with the start of the problem:

HP PC Hardware Diagnostics UEFI sp98383 v. 7.2.1.0

HP BIOS and System Firmware (R70) sp99341 v. 01.03.00

The machine perfomed flawlessly for a month before the update (new machine), hence I suspect the update.

The only fix I have tried thus far is to limit the maximum CPU utilization to 90%, which does not seem to have done anything.

Any help would be appeciated.

Who Me Too'd this topic
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