https://bugzilla.kernel.org/show_bug.cgi?id=199389

            Bug ID: 199389
           Summary: `Added _OSI(Linux-Dell-Video)` shown on Lenovo system
           Product: ACPI
           Version: 2.5
    Kernel Version: 4.16+
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
          Assignee: acpi_ot...@kernel-bugs.osdl.org
          Reporter: pmenzel+bugzilla.kernel....@molgen.mpg.de
        Regression: No

On a Lenovo X60t with coreboot, current Linux master shows the message `Added
_OSI(Linux-Dell-Video)`, which is confusing as it is not a Dell system.

    […]
    [    0.152111] calling  acpi_init+0x0/0x34b @ 1
    [    0.152142] ACPI: Added _OSI(Module Device)
    [    0.152210] ACPI: Added _OSI(Processor Device)
    [    0.152276] ACPI: Added _OSI(3.0 _SCP Extensions)
    [    0.152342] ACPI: Added _OSI(Processor Aggregator Device)
    [    0.152411] ACPI: Added _OSI(Linux-Dell-Video)
    [    0.157852] ACPI: 2 ACPI AML tables successfully acquired and loaded
    [    0.159362] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored
    [    0.162111] ACPI: EC: EC started
    […]

This was added in the commit below.

commit 9251a71db62ca9cc7e7cf364218610b0f018c291
Author: Alex Hung <alex.h...@canonical.com>
Date:   Wed Feb 28 19:27:55 2018 -0800

    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.h...@canonical.com>
    Signed-off-by: Rafael J. Wysocki <rafael.j.wyso...@intel.com>

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