CONFIG_APM_REAL_MODE_POWER_OFF is not available for thedefaultarchitecture x86.
Result is shown for architecture i386
default or selected kernelversion does not have config value CONFIG_APM_REAL_MODE_POWER_OFF.
Result is shown for kernelversion 5.4.123

Use real mode APM BIOS call to power off


Linux Kernel Configuration
└─>Power management options (ACPI, APM)
└─>APM (Advanced Power Management) BIOS Support
└─>Use real mode APM BIOS call to power off
In linux kernel since version 2.6.12  
Use real mode APM BIOS calls to switch off the computer. This is
a work-around for a number of buggy BIOSes. Switch this option on if
your computer crashes instead of powering off properly.