ACPI / OSI: Add OEM _OSI string to enable dGPU direct output
For HP Inc. mobile workstation with hybrid graphics support, dGPU can
directly output to external monitors; however, Nvidia and AMD's Linux
drivers aren't able to support this feature.
The OEM _OSI string "Linux-HPI-Hybrid-Graphics" is used by BIOS to
implement dGPU direct output to external monitors.
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 b2a16ed..efd2ce0 100644
--- a/drivers/acpi/osi.c
+++ b/drivers/acpi/osi.c
@@ -74,6 +74,13 @@ osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
* a BIOS workaround.
*/
{"Linux-Lenovo-NV-HDMI-Audio", true},
+ /*
+ * Linux-HPI-Hybrid-Graphics is used by BIOS to enable dGPU to
+ * output video directly to external monitors on HP Inc. mobile
+ * workstations as Nvidia and AMD VGA drivers provide limited
+ * hybrid graphics supports.
+ */
+ {"Linux-HPI-Hybrid-Graphics", true},
};
static u32 acpi_osi_handler(acpi_string interface, u32 supported)