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| author |   Alex Hung <alex.hung@canonical.com> | 2018-02-28 19:27:55 -0800 |
|---|---|---|
| committer |   Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2018-03-18 23:42:33 +0100 |
| commit | 9251a71db62ca9cc7e7cf364218610b0f018c291 (patch) | |
| tree | cef7f5f820fd248e67f2b594a36dddb8adebcefc /drivers/acpi/osi.c | |
| parent | Linux 4.16-rc5 (diff) | |
| download | linux-dev-9251a71db62ca9cc7e7cf364218610b0f018c291.tar.xz linux-dev-9251a71db62ca9cc7e7cf364218610b0f018c291.zip | |
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>
Diffstat (limited to 'drivers/acpi/osi.c')
| -rw-r--r-- | drivers/acpi/osi.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/acpi/osi.c b/drivers/acpi/osi.c index 76998a51bf99..8a8f43568510 100644 --- a/drivers/acpi/osi.c +++ b/drivers/acpi/osi.c @@ -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) |