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Commit 28586a51 authored by Alex Hung's avatar Alex Hung Committed by Rafael J. Wysocki
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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: default avatarAlex Hung <alex.hung@canonical.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 7566ec39

drivers/acpi/osi.c

+7 −0
Original line number Diff line number Diff line
@@ -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)