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Commit 9251a71d authored by Alex Hung's avatar Alex Hung Committed by Rafael J. Wysocki
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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: default avatarAlex Hung <alex.hung@canonical.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 0c8efd61

drivers/acpi/osi.c

+9 −0
Original line number Original line Diff line number Diff line
@@ -57,6 +57,15 @@ osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = { 
	{"Processor Device", true},

	{"Processor Device", true},

	{"3.0 _SCP Extensions", true},

	{"3.0 _SCP Extensions", true},

	{"Processor Aggregator Device", 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)

static u32 acpi_osi_handler(acpi_string interface, u32 supported)