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| author |   Alex Hung <alex.hung@canonical.com> | 2018-12-18 12:00:54 +0800 |
|---|---|---|
| committer |   Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2018-12-18 11:06:05 +0100 |
| commit | 28586a51eea666d5531bcaef2f68e4abbd87242c (patch) | |
| tree | d82117098b4bccba5cac85cff1fafcf43d83be4d /drivers/acpi | |
| parent | Linux 4.20-rc7 (diff) | |
| download | linux-dev-28586a51eea666d5531bcaef2f68e4abbd87242c.tar.xz linux-dev-28586a51eea666d5531bcaef2f68e4abbd87242c.zip | |
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>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/osi.c | 7 |
1 files changed, 7 insertions, 0 deletions
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) |