RM issue occured with HP ZBOOK +eGPU   RM gets the VBIOS through ACPI calls basically function  acpi_evaluate_object with values ACPI_TYPE_INTEGER along with offset and length to read. ACPI returns proper value and data. But in failing case i.r eGpu + iGpu after reboot, this call fails with value 5 and looks that it represent  AE_NOT_FOUND and since RM is not able to get VBIOS, RMInit failure occurs.