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ACPI / Sleep: Allow the NVS saving to be skipped during suspend to RAM

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Commit 2a6b69765a
(ACPI: Store NVS state even when entering suspend to RAM) caused the
ACPI suspend code save the NVS area during suspend and restore it
during resume unconditionally, although it is known that some systems
need to use acpi_sleep=s4_nonvs for hibernation to work.  To allow
the affected systems to avoid saving and restoring the NVS area
during suspend to RAM and resume, introduce kernel command line
option acpi_sleep=nonvs and make acpi_sleep=s4_nonvs work as its
alias temporarily (add acpi_sleep=s4_nonvs to the feature removal
file).

Addresses https://bugzilla.kernel.org/show_bug.cgi?id=16396 .

Signed-off-by: Rafael J. Wysocki <[email protected]>
Reported-and-tested-by: tomas m <[email protected]>
Signed-off-by: Len Brown <[email protected]>
This commit is contained in:
Rafael J. Wysocki 2010-07-23 22:59:09 +02:00 • committed by Len Brown
commit 72ad5d77fb
5 changed files with 34 additions and 23 deletions
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4
Documentation/kernel-parameters.txt
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@ -254,8 +254,8 @@ and is between 256 and 4096 characters. It is defined in the file
control method, with respect to putting devices into
low power states, to be enforced (the ACPI 2.0 ordering
of _PTS is used by default).
s4_nonvs prevents the kernel from saving/restoring the
ACPI NVS memory during hibernation.
nonvs prevents the kernel from saving/restoring the
ACPI NVS memory during suspend/hibernation and resume.
sci_force_enable causes the kernel to set SCI_EN directly
on resume from S1/S3 (which is against the ACPI spec,
but some broken systems don't work without it).