Re: [PATCH 5/7] platform/x86: fujitsu-laptop: do not update ACPI device power status

From: Darren Hart
Date: Wed Jun 21 2017 - 16:17:41 EST

On Fri, Jun 16, 2017 at 06:40:56AM +0200, MichaÅ KÄpieÅ wrote:
> Calling acpi_bus_update_power() for ACPI devices FUJ02B1 and FUJ02E3 is
> pointless as they are not power manageable (neither _PS0 nor _PR0 is
> defined for any of them), which causes their power state to be inherited
> from their parent devices. Given the ACPI paths of these two devices
> (\_SB.PCI0.LPCB.FJEX, \_SB.FEXT), their parent devices are also not
> power manageable. These parent devices will thus have their power state
> initialized to ACPI_STATE_D0, which in turn causes the power state for
> both FUJ02B1 and FUJ02E3 to always be ACPI_STATE_D0 ("on").

How confident are we that all implementations of these two ACPI devices lack
_PS0 and _PR0 ?

Darren Hart
VMware Open Source Technology Center