Messages in this thread | | | Date | Thu, 19 Jan 2006 10:23:00 -0500 | From | Dmitry Torokhov <> | Subject | Re: [Pcihpd-discuss] Re: [patch 0/4] Hot Dock/Undock support |
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On 1/18/06, Kristen Accardi <kristen.c.accardi@intel.com> wrote: > On Wed, 2006-01-18 at 23:23 +0100, Pavel Machek wrote: > <snip> > > Device GDCK looks like dock to my untrained eye. Unfortunately its > > type is IBM0079... ... > > > > Ahha, and ibm_acpi.c agrees with me. > > > > IBM_HANDLE(dock, root, "\\_SB.GDCK", /* X30, X31, X40 */ > > > > Scope (\_SB) > > { > > Device (GDCK) > > { > > Name (_HID, EisaId ("IBM0079")) > > Name (_CID, 0x150CD041) > > Method (_STA, 0, NotSerialized) > > { > > ... > > Method (_DCK, 1, NotSerialized) > > { > > Store (0x00, Local0) > > If (LEqual (GGID (), 0x03)) > > { > > Store (\_SB.PCI0.LPC.EC.SDCK (Arg0), Local0) > > } > > > > If (LEqual (GGID (), 0x00)) > > { > > Store (\_SB.PCI0.PCI1.DOCK.DDCK (Arg0), Local0) > > } > > > > Return (Local0) > > } > > > > Method (_EJ0, 1, NotSerialized) > > { > > If (LEqual (GGID (), 0x03)) > > { > > \_SB.PCI0.LPC.EC.SEJ0 (Arg0) > > } > > > > If (LEqual (GGID (), 0x00)) > > { > > \_SB.PCI0.PCI1.DOCK.DEJ0 (Arg0) > > } > > } > > .... > > > > Hope this helps. > > Pavel > > > so the problem that I see is that this dsdt defines two separate dock > devices, one outside the scope of pci, and one within it. The one > outside the scope of pci defines the _EJ0 and _DCK methods. So, when > acpiphp loads, it scans the pci slots for ejectable slots, finds none > (because _EJ0 is defined in the dock device that is outside the scope of > pci) and exits. This dsdt is different from the others I've used in > that most of them define all methods related to docking under the actual > dock bridge (within the scope of pci). perhaps some acpi people can > shed some light on the best way to handle this - otherwise I'm sure I > can hack something up that will be less than acceptable :). >
ACPI has (had?) a braindamage - it drops devices that do not present when initially scanning ACPI namespace. So if you boot undocked - too bad. Driver won't ever see your docking station.
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