From 9251a71db62ca9cc7e7cf364218610b0f018c291 Mon Sep 17 00:00:00 2001 From: Alex Hung Date: Wed, 28 Feb 2018 19:27:55 -0800 Subject: 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 Signed-off-by: Rafael J. Wysocki --- drivers/acpi/osi.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'drivers/acpi/osi.c') 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) -- cgit v1.2.3-59-g8ed1b