path: root/Documentation
diff options
authorRafael J. Wysocki <rjw@sisk.pl>2010-07-23 22:59:09 +0200
committerLen Brown <len.brown@intel.com>2010-07-24 23:26:09 -0400
commit72ad5d77fb981963edae15eee8196c80238f5ed0 (patch)
treea6fa9a0b9ba924fd2dd91debf3e8ab04e8084338 /Documentation
parentb37fa16e78d6f9790462b3181602a26b5af36260 (diff)
ACPI / Sleep: Allow the NVS saving to be skipped during suspend to RAM
Commit 2a6b69765ad794389f2fc3e14a0afa1a995221c2 (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 <rjw@sisk.pl> Reported-and-tested-by: tomas m <tmezzadra@gmail.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'Documentation')
2 files changed, 9 insertions, 2 deletions
diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
index c268783bc4e..1571c0c83db 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -647,3 +647,10 @@ Who: Stefan Richter <stefanr@s5r6.in-berlin.de>
+What: The acpi_sleep=s4_nonvs command line option
+When: 2.6.37
+Files: arch/x86/kernel/acpi/sleep.c
+Why: superseded by acpi_sleep=nonvs
+Who: Rafael J. Wysocki <rjw@sisk.pl>
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 4ddb58df081..2b2407d9a6d 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -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).