From: Alex Hung Date: Tue, 18 Dec 2018 04:00:54 +0000 (+0800) Subject: ACPI / OSI: Add OEM _OSI string to enable dGPU direct output X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=28586a51eea666d5531bcaef2f68e4abbd87242c;p=openwrt%2Fstaging%2Fblogic.git 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 Signed-off-by: Rafael J. Wysocki --- diff --git a/drivers/acpi/osi.c b/drivers/acpi/osi.c index b2a16ed7e81a..efd2ce099893 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)