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ACPI suspend: Call _PTS before suspending devices

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The ACPI 1.0 specification wants us to put devices into low power
states after executing the _PTS global control method, while ACPI
2.0 and later want us to do that in the reverse order.  The current
suspend code follows ACPI 2.0 in that respect which causes some
ACPI 1.0x systems to hang during suspend (ref.
http://bugzilla.kernel.org/show_bug.cgi?id=9528).

Make the suspend code execute _PTS before putting devices into low
power states (ie. in accordance with ACPI 1.0x) and provide a command
line option to override the default if need be.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Rafael J. Wysocki
2008-01-08 00:07:39 +01:00
committed by Len Brown
parent 3c1d2b6085
commit 60417f5976
2 changed files with 43 additions and 13 deletions
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5
Documentation/kernel-parameters.txt
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@@ -168,6 +168,11 @@ and is between 256 and 4096 characters. It is defined in the file
acpi_irq_isa= [HW,ACPI] If irq_balance, mark listed IRQs used by ISA
Format: <irq>,<irq>...
acpi_new_pts_ordering [HW,ACPI]
Enforce the ACPI 2.0 ordering of the _PTS control
method wrt putting devices into low power states
default: pre ACPI 2.0 ordering of _PTS
acpi_no_auto_ssdt [HW,ACPI] Disable automatic loading of SSDT
acpi_os_name= [HW,ACPI] Tell ACPI BIOS the name of the OS