Is the V3 patch meet the expectation or is there anything I need to refine?
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)
> --
> 2.7.4
>
--
Cheers,
Alex Hung
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