Landing last week was already the big ACPI+PM pull request for Linux 4.5 while submitted yesterday was some extra feature material for this kernel cycle with the merge window not closing until Sunday.
This second serving of power management changes for Linux 4.5 isn't as exciting as the first one, but there is one feature that sticks out. With this new code, if a USB device is suspended, it will now stay suspended across system suspend/resume cycles. Previously, the suspended USB device would have waken up automatically when the system resumed, but now it's tracked to not resume if the USB device was already suspended prior to the system suspend. There's also been some fixes around this suspended code.
Other work includes updating ACPICA, fixing a CPU idle menu governor regression, more ACPI backlight quirks, and various fixes. More details via this pull request by Intel's Rafael Wysocki.