On Mon, Mar 19, 2018 at 6:01 PM, Alex Hung <alex.hung@xxxxxxxxxxxxx> wrote:
> Is the V3 patch meet the expectation or is there anything I need to refine?
It has been tentatively queued up for 4.17.
Thanks!
> On Wed, Feb 28, 2018 at 7:27 PM, Alex Hung <alex.hung@xxxxxxxxxxxxx> wrote:
>> 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@xxxxxxxxxxxxx>
>> ---
>> drivers/acpi/osi.c | 8 ++++++++
>> 1 file changed, 8 insertions(+)
>>
>> diff --git a/drivers/acpi/osi.c b/drivers/acpi/osi.c
>> index 76998a5..a22fe3a 100644
>> --- a/drivers/acpi/osi.c
>> +++ b/drivers/acpi/osi.c
>> @@ -57,6 +57,14 @@ 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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