ACPI / OSI: Add OEM _OSI string to enable NVidia HDMI audio

Some ThinkPad systems have a power-saving feature that turns off HDMI
audio device in Windows, but NVidia Linux driver does not support this
feature. As a result, HDMI audio will not work on Linux.

A BIOS workaround is added with an OEM_OSI string
"Linux-Lenovo-NV-HDMI-Audio" to power on NVidia HDMI audio when booting.

The form of the OEM _OSI strings is defined by each OEMs and is
discussed in Documentation/acpi/osi.txt.

Signed-off-by: Alex Hung <alex.hung@canonical.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/osi.c b/drivers/acpi/osi.c
index 8a8f43568510064571e42cf195680c30d5d46d9f..b2a16ed7e81a97da10129fcaea23ce93a4926f3c 100644 (file)
--- a/drivers/acpi/osi.c
+++ b/drivers/acpi/osi.c
@@ -66,6 +66,14 @@ osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
         * be removed if both new and old graphics cards are supported.
         */
        {"Linux-Dell-Video", true},
+       /*
+        * Linux-Lenovo-NV-HDMI-Audio is used by BIOS to power on NVidia's HDMI
+        * audio device which is turned off for power-saving in Windows OS.
+        * This power management feature observed on some Lenovo Thinkpad
+        * systems which will not be able to output audio via HDMI without
+        * a BIOS workaround.
+        */
+       {"Linux-Lenovo-NV-HDMI-Audio", true},
 };
 
 static u32 acpi_osi_handler(acpi_string interface, u32 supported)