ACPI/ECDT on gateway 200x notebook

[Rich Ibbotson <richibb-aYIB8uWIUb2Vn7q6wjsIow@public.gmane.org>]

Dear ACPI Gurus,

I'm trying to get ACPI working on a Gateway 200X (200ARC) notebook
running Linux with kernel 2.4.23 (built from sources).  The specs for
this notebook claim that it has APM 1.2 and ACPI 2.0 support.  However,
when I run a kernel with ACPI enabled (as a module) the
/proc/acpi/battery and /proc/acpi/ac_adapter directories are both empty
and I see these messages at boot time:

  kernel:     ACPI-1120: *** Error: Method execution failed 
[\_SB_.ADP1._STA] (Node c12f88c0), AE_AML_NO_RETURN_VALUE
  kernel:     ACPI-1120: *** Error: Method execution failed 
[\_SB_.BAT1._STA] (Node c12f89c0), AE_AML_NO_RETURN_VALUE

I see that this has been discussed here before, and it looks like the
consensus is that I need to manually install an ECDT at boot time.

The latest discussions of this problem that I've seen are here:
http://sourceforge.net/mailarchive/forum.php?thread_id=3451648&forum_id=6102
http://sourceforge.net/mailarchive/forum.php?thread_id=3479606&forum_id=6102

After reading those threads, I've tried two things to get ACPI working:

1) Patch the latest 2.4.23 kernel sources with acpi-20031203-2.4.23.diff
and the "fake_ecdt" patch from Ducrot Bruno, passing the string
"ecdt_fake=0x66:0x62:28:1:\\_SB_.PCI0.LPCB.H_EC" to the kernel at boot
time (my _GPE is 0x1c and the _UID reported by acpidmp under Device H_EC
is 0x01)

I see that the fake ecdt does not work, but I am not sure why.  I see
nothing between the following two logs:

  kernel: ACPI: Faking ECDT
  kernel: ACPI: Could not use ECDT

If I specify the path as "\_SB_.PCI0.LPCB.H_EC" (only one "\") in my
grub.conf, I see the following:

  kernel: ACPI: Faking ECDT
  kernel: evregion-0347: *** Error: Handler for [EmbeddedControl]
returned AE_BAD_PARAMETER
  kernel:  dswexec-0435 [11] ds_exec_end_op        : [Store]: Could not
resolve operands, AE_BAD_PARAMETER
  kernel:  psparse-1120: *** Error: Method execution failed
[\_SB_.PCI0.LPCB.H_EC._REG] (Node c13f6c68), AE_BAD_PARAMETER
  kernel: ACPI: Could not use ECDT

I do see an entry for "\_SB_.PCI0.LPCB.H_EC._REG" in the DSDT, though:

000028c5:         Method _REG (\_SB_.PCI0.LPCB.H_EC._REG)
000028cb:           ArgCount 2; NotSerialized
000028cc:           If
000028ce:             LAnd
000028cf:               LEqual
000028d0:                 Arg0
000028d1:                 0x03
000028d3:               LEqual
000028d4:                 Arg1
000028d5:                 0x01
000028d7:             Store
000028d8:               0x01
000028da:               ECON (0000024e)
000028de:             Store
000028df:               \_SB_.PCI0.LPCB.H_EC.ACEX (00002844)
000028f6:               \PWRS (00000160)

I'm not sure if this means that it got a little further, or if this is
an error because I should have used both backslashes.

2) I would like to try actually supplying an ECDT, using the information
below (I got much of this from the DSDT, but I'm not sure if the Creator
ID/Creator Revision matter).  Is there a suggested way to put this into
a char[] or some form that can be used in acpi_os_table_override?  If I
can get it into a char[] then I guess I can calculate the checksum and
length, but if not then how do I compute these?

    ECDT: Length=?, Revision=1, Checksum=?,
          OEMID=INTEL, OEM Table ID=MONTARAG, OEM Revision=0x06040000,
          Creator ID=fake, Creator Revision=0x1
          EC_CONTROL=0x66:0[8] (IO)
          EC_DATA=0x62:0[8] (IO)
          UID=1, GPE_BIT=0x1c
          EC_ID=\_SB_.PCI0.LPCB.H_EC


thanks for any advice,
Rich





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