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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-08-27 03:28:48 +0400
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-08-27 03:28:48 +0400
commitafdca01c9821134e71011029a194dd8fcb88c97e (patch)
treec3a4862547760c3aaae5a8260ba3796a40bf47a6 /Documentation/kernel-parameters.txt
parent4b319f290d3b9c756228a66f72095d0039ec1b50 (diff)
parent36b99b22877bd25162239f1b00477ee6ae2d01ee (diff)
downloadlinux-afdca01c9821134e71011029a194dd8fcb88c97e.tar.xz
Merge branch 'acpica'
* acpica: ACPICA: Update version to 20130725. ACPICA: Update names for walk_namespace callbacks to clarify usage. ACPICA: Return error if DerefOf resolves to a null package element. ACPICA: Make ACPI Power Management Timer (PM Timer) optional. ACPICA: Fix divergences of the commit - ACPICA: Expose OSI version. ACPICA: Fix possible fault for methods that optionally have no return value. ACPICA: DeRefOf operator: Update to fully resolve FieldUnit and BufferField refs. ACPICA: Emit all unresolved method externals in a text block ACPICA: Export acpi_tb_validate_rsdp(). ACPI: Add facility to remove all _OSI strings ACPI: Add facility to disable all _OSI OS vendor strings ACPICA: Add acpi_update_interfaces() public interface ACPICA: Update version to 20130626 ACPICA: Fix compiler warnings for casting issues (only some compilers) ACPICA: Remove restriction of 256 maximum GPEs in any GPE block ACPICA: Disassembler: Expand maximum output string length to 64K ACPICA: TableManager: Export acpi_tb_scan_memory_for_rsdp() ACPICA: Update comments about behavior when _STA does not exist
Diffstat (limited to 'Documentation/kernel-parameters.txt')
-rw-r--r--Documentation/kernel-parameters.txt55
1 files changed, 53 insertions, 2 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 7f9d4f53882c..03c196d90da3 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -235,10 +235,61 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
Format: To spoof as Windows 98: ="Microsoft Windows"
acpi_osi= [HW,ACPI] Modify list of supported OS interface strings
- acpi_osi="string1" # add string1 -- only one string
- acpi_osi="!string2" # remove built-in string2
+ acpi_osi="string1" # add string1
+ acpi_osi="!string2" # remove string2
+ acpi_osi=!* # remove all strings
+ acpi_osi=! # disable all built-in OS vendor
+ strings
acpi_osi= # disable all strings
+ 'acpi_osi=!' can be used in combination with single or
+ multiple 'acpi_osi="string1"' to support specific OS
+ vendor string(s). Note that such command can only
+ affect the default state of the OS vendor strings, thus
+ it cannot affect the default state of the feature group
+ strings and the current state of the OS vendor strings,
+ specifying it multiple times through kernel command line
+ is meaningless. This command is useful when one do not
+ care about the state of the feature group strings which
+ should be controlled by the OSPM.
+ Examples:
+ 1. 'acpi_osi=! acpi_osi="Windows 2000"' is equivalent
+ to 'acpi_osi="Windows 2000" acpi_osi=!', they all
+ can make '_OSI("Windows 2000")' TRUE.
+
+ 'acpi_osi=' cannot be used in combination with other
+ 'acpi_osi=' command lines, the _OSI method will not
+ exist in the ACPI namespace. NOTE that such command can
+ only affect the _OSI support state, thus specifying it
+ multiple times through kernel command line is also
+ meaningless.
+ Examples:
+ 1. 'acpi_osi=' can make 'CondRefOf(_OSI, Local1)'
+ FALSE.
+
+ 'acpi_osi=!*' can be used in combination with single or
+ multiple 'acpi_osi="string1"' to support specific
+ string(s). Note that such command can affect the
+ current state of both the OS vendor strings and the
+ feature group strings, thus specifying it multiple times
+ through kernel command line is meaningful. But it may
+ still not able to affect the final state of a string if
+ there are quirks related to this string. This command
+ is useful when one want to control the state of the
+ feature group strings to debug BIOS issues related to
+ the OSPM features.
+ Examples:
+ 1. 'acpi_osi="Module Device" acpi_osi=!*' can make
+ '_OSI("Module Device")' FALSE.
+ 2. 'acpi_osi=!* acpi_osi="Module Device"' can make
+ '_OSI("Module Device")' TRUE.
+ 3. 'acpi_osi=! acpi_osi=!* acpi_osi="Windows 2000"' is
+ equivalent to
+ 'acpi_osi=!* acpi_osi=! acpi_osi="Windows 2000"'
+ and
+ 'acpi_osi=!* acpi_osi="Windows 2000" acpi_osi=!',
+ they all will make '_OSI("Windows 2000")' TRUE.
+
acpi_pm_good [X86]
Override the pmtimer bug detection: force the kernel
to assume that this machine's pmtimer latches its value