[ACPI] document cmdline acpi_os_name=

This can sometimes be used to work around broken BIOS.
Use "Microsoft Windows" to take the same path
through the BIOS as Windows98 would.

The default is "Microsoft Windows NT", which
is what NT and later versions of Windows use,
and is the most tested path through most BIOS.

Set it to anything else, including "Linux", at your
own risk, as it seems that virtually no BIOS
has been tested with anything but the two options above.

Note that this uses the legacy _OS interface, so
we don't expect this to ever change.

Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index f8cb55c30b0f..78eb66b8619c 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -139,6 +139,9 @@ running once the system is up.
         acpi_irq_isa=   [HW,ACPI] If irq_balance, mark listed IRQs used by ISA
                         Format: <irq>,<irq>...
 
+        acpi_os_name=   [HW,ACPI] Tell ACPI BIOS the name of the OS
+                        Format: To spoof as Windows 98: ="Microsoft Windows"
+
         acpi_osi=       [HW,ACPI] empty param disables _OSI
 
         acpi_serialize  [HW,ACPI] force serialization of AML methods