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From: Mauritz Sundell <mauritz.sundell@home.se>
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Subject: ACPI hangs after Mounting root and trying /sbin/init (Work-around
 for Compaq Evo N160) 
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ACPI stopped working after I upgraded my kernel/world last week after
not doing that for a while.

Without knowing the details of what I am doing, the following allows me to
have ACPI enabled including suspend-to-disk and a working pccard
(probably not everything works but the essentials for me do)

Workaround for Compaq Evo N160:

1. Dump your ACPI tables and for Method \_SB.PCI0._PRT remove Package
(0x04) { 0x001DFFFF, 0x03, \_SB.PCI0.LPCB.LNKH, 0x00 } from return value
(dont know why).
Recompile and install in /boot/DSDT.aml
Contact me if you want my DSDT.aml or .asl

2. In /boot/device.hints:
acpi_dsdt_load="YES"
acpi_dsdt_name="/boot/DSDT.aml"
hw.acpi.pci.link.2.6.0.irq="10"

3. Other lines in /boot/device.hints that I have since before
debug.acpi.disable="lid"
hw.cbb.start_memory="0xd0208000"

--
Mauritz Sundell