On Tuesday, December 18, 2018 5:00:54 AM CET Alex Hung wrote:
> For HP Inc. mobile workstation with hybrid graphics supports, 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@xxxxxxxxxxxxx>
> ---
> drivers/acpi/osi.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/drivers/acpi/osi.c b/drivers/acpi/osi.c
> index e83297e..b6d3172 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)
>
Applied, thanks!
