ACPI errors on Asus M6R with > 2.6.9

[ the following is more-or-less filled into the Kernel bugzilla at
http://bugme.osdl.org/show_bug.cgi?id=4150 - I just want to add some questions to ACPI gurus here :-]

Hi all,

I have an Asus M6R laptop (http://www.fi.muni.cz/~kas/m6r/) - ACPI seems to work with 2.6.8.1 and 2.6.9 but with anything newer I am getting ACPI errors on boot and most ACPI-related features do not work (battery status, ASUS modem LED, etc.).

The first error is the following:
ACPI-1138: *** Error: Method execution failed [\MCTH] (Node ddf006e0), AE_AML_BUFFER_LIMIT

The \MCTH method seems to be a clumsy variant of strcmp() - I have managed to fix it by adding the lines marked with "+". Is my fix correct or is post-2.6.9 ACPI interpreter wrong?

    Method (MCTH, 2, NotSerialized)
    {
        If (LLess (SizeOf (Arg0), SizeOf (Arg1)))
        {
            Return (Zero)
        }

+ If (LLess (SizeOf (Arg1), SizeOf (Arg0)))
+ {
+ Return (Zero)
+ }

        Add (SizeOf (Arg0), 0x01, Local0)
        Name (BUF0, Buffer (Local0) {})
        Name (BUF1, Buffer (Local0) {})
        Store (Arg0, BUF0)
        Store (Arg1, BUF1)
        While (Local0)
        {
            Decrement (Local0)
            If (LNot (LEqual (DerefOf (Index (BUF0, Local0)), DerefOf (Index (BUF1, Local0)))))
            {
                Return (Zero)
            }
        }
        Return (One)
    }

The above method is called by the following code:

        Store (0x01, OSVR)
        If (MCTH (\_OS, "Microsoft Windows NT"))
        {
            Store (0x00, OSVR)
        }

        Return (OSVR)

The second problem is the following error (which repeats itself after almost any ACPI operation):

ACPI-0405: *** Error: Handler for [EmbeddedControl] returned AE_TIME

Again, 2.6.9 works, anything newer does not. I do not know how to solve this problem. Any ideas?

My source and binary DSDT files are attached to the bugzilla entry mentioned above.

Thanks,

-Yenya

| Jan "Yenya" Kasprzak  <kas at {fi.muni.cz - work | yenya.net - private}> |
| GPG: ID 1024/D3498839      Fingerprint 0D99A7FB206605D7 8B35FCDE05B18A5E |
| http://www.fi.muni.cz/~kas/   Czech Linux Homepage: http://www.linux.cz/ |

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