When I experience weird power related problems (and problems with reboot), I go right to the BIOS or UEFI and ensure the firmware is the latest. UEFI is where the ACPI tables are located, and that affects all power behavior. So I think your first step is to ensure the firmware is up to date. I also disable S3 and S4 sleep states in the firmware. In this case, I don't want both the firmware and OS to try to control power states. Jeff
Thank Walton!
this pc is very old, it hasn't uefi
the only firmware i am aware of is rtl8188eufw.bin used by wifi adapter
both 12.5 and 12.7 use same rtl8188eufw.bin i believe
12.5 is installed in usb stick while 12.7 is in sata disk