| Message ID | 20181218040054.23182-1-alex.hung@canonical.com (mailing list archive) |
|---|---|
| State | Accepted, archived |
| Delegated to: | Rafael Wysocki |
| Headers | show |
| Series | ACPI / OSI: Add OEM _OSI string to enable dGPU direct output | expand |
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@canonical.com> > --- > 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!
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)
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@canonical.com> --- drivers/acpi/osi.c | 7 +++++++ 1 file changed, 7 insertions(+)