Mmm, this change from D55253 is deliberate. Autonomous mode does not work on some AMD CPUs, where setting "desired performance" to 0 actually causes lowest performance to be selected. As long as we do not have a user-understandable way to choose a better default, such as PM profile in ACPI's FADT, let's do like all other CPU freq/power drivers do (except hwpstate_intel(4)) and select maximum performance. Let's revise this only as part of actually implementing one.