New
#1
No SLEEP - powers down
An ASUS z390a, I7-8000, running Windows 10 was recently updated with the current BIOS, and switched to UEFI/GPT/secure boot in prep for Win 11.
SLEEP no longer works correctly, but instead powers down after a few minutes. When the power button is subsequently pressed W10 soon pops up without going through POST.
This error is generated in Event Viewer: The system firmware has changed the processor's memory type range registers (MTRRs) across a sleep state transition (S4).
The status of Fast Start up in W10 makes no difference; neither does Fast Boot in the BIOS. The latest NVidia display driver is installed.
Many FAQs and threads have been read, but it's unclear how to remedy the issue.
Clues please??