D6023.id.diff
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	Index: head/sys/dev/acpica/acpi_pcib_acpi.c
	===================================================================
	--- head/sys/dev/acpica/acpi_pcib_acpi.c
	+++ head/sys/dev/acpica/acpi_pcib_acpi.c
	@@ -295,6 +295,40 @@
	}
	#endif

	+static void
	+acpi_pcib_osc(struct acpi_hpcib_softc *sc)
	+{
	+ ACPI_STATUS status;
	+ uint32_t cap_set[3];
	+
	+ static uint8_t pci_host_bridge_uuid[ACPI_UUID_LENGTH] = {
	+ 0x5b, 0x4d, 0xdb, 0x33, 0xf7, 0x1f, 0x1c, 0x40,
	+ 0x96, 0x57, 0x74, 0x41, 0xc0, 0x3d, 0xd7, 0x66
	+ };
	+
	+ /* Support Field: Extended PCI Config Space, MSI */
	+ cap_set[1] = 0x11;
	+
	+ /* Control Field */
	+ cap_set[2] = 0;
	+
	+ status = acpi_EvaluateOSC(sc->ap_handle, pci_host_bridge_uuid, 1,
	+ nitems(cap_set), cap_set, false);
	+ if (ACPI_FAILURE(status)) {
	+ if (status == AE_NOT_FOUND)
	+ return;
	+ device_printf(sc->ap_dev, "_OSC failed: %s\n",
	+ AcpiFormatException(status));
	+ return;
	+ }
	+
	+ if (cap_set[0] != 0) {
	+ device_printf(sc->ap_dev, "_OSC returned error %#x\n",
	+ cap_set[0]);
	+ return;
	+ }
	+}
	+
	static int
	acpi_pcib_acpi_attach(device_t dev)
	{
	@@ -321,6 +355,8 @@
	if (!acpi_DeviceIsPresent(dev))
	return (ENXIO);

	+ acpi_pcib_osc(sc);
	+
	/*
	* Get our segment number by evaluating _SEG.
	* It's OK for this to not exist.