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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: Alex Hung <alex.hung@canonical.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Alex Hung 2018-02-28 19:27:55 -08:00 committed by Rafael J. Wysocki
parent 0c8efd610b
commit 9251a71db6
1 changed files with 9 additions and 0 deletions
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9
drivers/acpi/osi.c
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@ -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)