[Bug 212985] ideapad_acpi: VPC2004:00: DYTC interface is not available. platform_profile interface is unavailable

[Bug 212985] ideapad_acpi: VPC2004:00: DYTC interface is not available. platform_profile interface is unavailable

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=212985

Borislav Petkov (bp@alien8.de) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bp@alien8.de
           Assignee|platform_x86_64@kernel-bugs |platform-driver-x86@vger.ke
                   |.osdl.org                   |rnel.org

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[Bug 212985] ideapad_acpi: VPC2004:00: DYTC interface is not available. platform_profile interface is unavailable

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https://bugzilla.kernel.org/show_bug.cgi?id=212985

Barnabás Pőcze (pobrn@protonmail.com) changed:

           What    |Removed                     |Added
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                 CC|                            |pobrn@protonmail.com

--- Comment #1 from Barnabás Pőcze (pobrn@protonmail.com) ---
That message is not necessarily a bug. That interface is not available on all
devices. Can you check if the VPC2004 ACPI device has a method named "DYTC"?

> The conservation_mode interface is available but cannot be used.

Sorry, that's on me. There is a glaring typo in the driver, I'll send a patch
to fix it shortly.

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[Bug 212985] ideapad_acpi: VPC2004:00: DYTC interface is not available. platform_profile interface is unavailable

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https://bugzilla.kernel.org/show_bug.cgi?id=212985

--- Comment #2 from Tim S (tsweet64@protonmail.com) ---
Thanks a lot.

> Can you check if the VPC2004 ACPI device has a method named "DYTC"?

If I'm understanding correctly, you're saying to check the disassembled ACPI
tables, right? The disassembled dsdt.dsl does appear to contain a DYTC method:

        Device (VPC0)
        {
            Name (_HID, "VPC2004")  // _HID: Hardware ID
            Name (_UID, Zero)  // _UID: Unique ID
            Name (_VPC, Zero)
            Name (VPCD, Zero)
            Method (_STA, 0, NotSerialized)  // _STA: Status
            {
                Return (0x0F)
            }

            Method (DYTC, 1, Serialized)
            {
                ITSV = Zero
                ITSM = Zero
                Local0 = Zero
                Local1 = (Arg0 & 0x01FF)
                Local2 = (Arg0 & 0xFFFFFE00)
                Switch (Local1)
                {
                    Case (Zero)

         ....

I'll attach the full file, in case it is needed.

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[Bug 212985] ideapad_acpi: VPC2004:00: DYTC interface is not available. platform_profile interface is unavailable

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https://bugzilla.kernel.org/show_bug.cgi?id=212985

--- Comment #3 from Tim S (tsweet64@protonmail.com) ---
Created attachment 296693
  --> https://bugzilla.kernel.org/attachment.cgi?id=296693&action=edit
ACPI: Dissassembly of dsdt.dat via iasl

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[Bug 212985] ideapad_acpi: VPC2004:00: DYTC interface is not available. platform_profile interface is unavailable

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https://bugzilla.kernel.org/show_bug.cgi?id=212985

--- Comment #4 from Barnabás Pőcze (pobrn@protonmail.com) ---
> If I'm understanding correctly, you're saying to check the disassembled ACPI
> tables, right?

Yes, exactly.

From this part:


            Method (DYTC, 1, Serialized)
            {
                ITSV = Zero
                ITSM = Zero
                Local0 = Zero
                Local1 = (Arg0 & 0x01FF)
                Local2 = (Arg0 & 0xFFFFFE00)
                Switch (Local1)
                {
                    Case (Zero)
                    {
                        If (!Local2)
                        {
                            Local0 |= One
                            Local0 |= 0x0100
                            Local0 |= Zero
                            Local0 |= 0x40000000
                        }
                        Else
                        {
                            Local0 |= Zero
                            Local0 |= 0x04
                        }
                    }


it **seems to me** that only DYTC v4 is supported on that model - although I'm
not sure. The ideapad_acpi driver will only expose the platform_profile
functionality if it finds DYTC v5 or newer. The code was adapted from the
thinkpad_acpi driver, and the platform_profile support was contributed to that
driver by Lenovo employee Mark Pearson. I cannot remember the exact reason why
earlier versions are not supported, you could possibly write to the PDx86
mailing list (platform-driver-x86 at vger.kernel.org) and CC him if you want to
know more; or search back on lore.kernel.org.

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[Bug 212985] ideapad_acpi: VPC2004:00: DYTC interface is not available. platform_profile interface is unavailable

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--- Comment #5 from Tim S (tsweet64@protonmail.com) ---
Okay, that makes sense. Thank you so much!

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[Bug 212985] ideapad_acpi: VPC2004:00: DYTC interface is not available. platform_profile interface is unavailable

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Luis O (lortegap@protonmail.com) changed:

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----------------------------------------------------------------------------
                 CC|                            |lortegap@protonmail.com

--- Comment #6 from Luis O (lortegap@protonmail.com) ---
Sorry for bothering, but I noticed than in kernel 5.16.5 there's a new message:

[    8.069951] ideapad_acpi VPC2004:00: DYTC_VERSION is less than 4 or is not
allowed: 4
[    8.069953] ideapad_acpi VPC2004:00: DYTC interface is not available

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