Bug 199389 - `Added _OSI(Linux-Dell-Video)` shown on Lenovo system
Summary: `Added _OSI(Linux-Dell-Video)` shown on Lenovo system
Status: CLOSED INVALID
Alias: None
Product: ACPI
Classification: Unclassified
Component: Other (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: Zhang Rui
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2018-04-13 14:20 UTC by Paul Menzel
Modified: 2018-05-03 13:53 UTC (History)
3 users (show)

See Also:
Kernel Version: 4.16+
Subsystem:
Regression: No
Bisected commit-id:

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Description Paul Menzel 2018-04-13 14:20:45 UTC 
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.hung@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.hung@canonical.com>
    Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Comment 1 Zhang Rui 2018-04-25 03:42:24 UTC 
I don't think that is a problem.
   [    0.152411] ACPI: Added _OSI(Linux-Dell-Video)
This exports the OS capability, not BIOS capability.

It just means Linux supports OEM _OSI("Linux-Dell-Video"), if BIOS has it.
Comment 2 Zhang Rui 2018-04-25 03:42:43 UTC 
I'd prefer to get the bug closed, what do you think?
Comment 3 Zhang Rui 2018-05-02 03:19:09 UTC 
hmm, I will close it as this does not seem like a kernel bug to me.
Comment 4 Paul Menzel 2018-05-03 13:53:01 UTC 
Thank you for the clarification. I think the messages should be reworded to make it more clear, but this is a different issue.
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