Commit 9251a71d authored Feb 28, 2018 by Alex Hung Committed by Rafael J. Wysocki Mar 18, 2018

ACPI / OSI: Add OEM _OSI strings to disable NVidia RTD3



A number of Dell systems require an OEM _OSI string "Linux-Dell-Video"
as a BIOS workaround to disable RTD3 which causes systems hangs when
NVidia graphics cards are installed.  The affected Dell systems are
with system IDs: 0818, 0819, 0820, 0850, 0851, 086F, 0870, 0885 and
0886.

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>

parent 0c8efd61

drivers/acpi/osi.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -57,6 +57,15 @@ osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
		{"Processor Device", true},
		{"3.0 _SCP Extensions", true},
		{"Processor Aggregator Device", true},
		/*
		* Linux-Dell-Video is used by BIOS to disable RTD3 for NVidia graphics
		* cards as RTD3 is not supported by drivers now. Systems with NVidia
		* cards will hang without RTD3 disabled.
		*
		* Once NVidia drivers officially support RTD3, this _OSI strings can
		* be removed if both new and old graphics cards are supported.
		*/
		{"Linux-Dell-Video", true},
		};

		static u32 acpi_osi_handler(acpi_string interface, u32 supported)

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