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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: Alex Hung <alex.hung@canonical.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
hifive-unleashed-5.1
Alex Hung 2018-12-18 12:00:54 +08:00 committed by Rafael J. Wysocki
parent 7566ec393f
commit 28586a51ee
1 changed files with 7 additions and 0 deletions
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7
drivers/acpi/osi.c
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@ -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)