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    SubjectRe: Linux Support for Thunderbolt using Apple Monitor
    Hey Jiang,

    Jiang Liu [Sat, May 05, 2012 at 11:18:09PM +0800]:
    > It seems that the PCI topology related to the Thunderbird is:

    Thanks for digging into this, I've the feeling we could somehow get
    this running in the end...

    > [...]
    > According to the acpidump sent out by you, I guess the relationship among PCIe and ACPI is as below:
    > Device (PCI0) // PCIe host bridge
    > {
    > Name (_HID, EisaId ("PNP0A08"))
    > Device (P0P2) //00:01.0
    > {
    > Name (_ADR, 0x00010000)
    > Device (UPSB) //03:00.0
    > {
    > Name (_ADR, 0x00)
    > Device (DSB2) //04:04.0
    > {
    > Name (_ADR, 0x00040000)
    > Method (_RMV, 0, NotSerialized)
    > {
    > Return (OSDW ()) // OSDW-> OS is Darwin
    > }
    > Device (UPS2) //37:00.0
    > {
    > Name (_ADR, 0x00)
    > }
    > }
    > }
    > }
    > }
    >
    > But _RMV method only returns 1 on iOS or Max OS X. That means ACPI based hotplug is disabled
    > on Linux for your system. And as Yinghai has pointed out, all the PCIe downstream ports on
    > the system don't support PCIe hotplug. So need BIOS or hardware changes to support Thunderbolt
    > cable hotplug on your system.

    I'm not deep into how acpi works, but wondering: Can't we replace that part,
    change the tree or emulate a different OSDW() method similar to LD_PRELOAD?

    Cheers,

    Nico

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