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Initially ACPI is exclusive to x86 architecture; Revision 5.0 of the ACPI specification was released in December 2011, [15] which added the ARM architecture support. The revision 5.1 was released in July 2014. [16] The latest specification revision is 6.5, which was released in August 2022. [6]
There is the ability to opt out of APM control on a device-by-device basis, which can be used if a driver wants to communicate directly with a hardware device. Communication occurs both ways; power management events are sent from the BIOS to the APM driver, and the APM driver sends information and requests to the BIOS via function calls.
The High Precision Event Timer (HPET) is a hardware timer available in modern x86-compatible personal computers.Compared to older types of timers available in the x86 architecture, HPET allows more efficient processing of highly timing-sensitive applications, such as multimedia playback and OS task switching.
Inter alia with Windows 10 and 8, this can be fixed by forcing the correct drivers to reload during Safe Mode. [9] In Windows 8, Windows 8.1 and Windows Server 2012, the controller driver has changed from msahci to storahci, [10] and the procedures to upgrade to the AHCI controller is similar to that of Windows 7. [11]