[    0.000000] ACPI: DSDT 7BF5C167, 87DF (r1 NVIDIA    MCP67  6040000
MSFT  3000000)

[    0.448028] ACPI: Core revision 20080321
[    0.450665] ACPI: Looking for DSDT in initramfs... successfully read 34783 
bytes from /DSDT.aml.
[    0.450826] ACPI: Override [DSDT-   MCP67], this is unsafe: tainting kernel
[    0.450893] ACPI: Table DSDT replaced by host OS
[    0.451042] ACPI: DSDT 00000000, 87DF (r1 NVIDIA    MCP67  6040000 MSFT  
3000000)
[    0.451205] ACPI: DSDT override uses original SSDTs unless 
"acpi_no_auto_ssdt"
[    0.456028] ENABLING IO-APIC IRQs

[    0.584031] Setting up standard PCI resources
[    0.584683] ACPI: EC: Look up EC in DSDT
[    0.586820] ACPI: BIOS _OSI(Linux) query ignored via DMI
[    0.587522] ACPI: Interpreter enabled
[    0.587583] ACPI: (supports S0 S3 S4 S5)
[    0.587828] ACPI: Using IOAPIC for interrupt routing
[    0.588053] ACPI: EC: non-query interrupt received, switching to interrupt 
mode

pause till I hit power

I don't quite understand the wording of "DSDT override uses original
SSDTs unless "acpi_no_auto_ssdt" so I tried it:

[    0.450665] ACPI: Looking for DSDT in initramfs... successfully read 34783 
bytes from /DSDT.aml.
[    0.450826] ACPI: Override [DSDT-   MCP67], this is unsafe: tainting kernel
[    0.450893] ACPI: Table DSDT replaced by host OS
[    0.451042] ACPI: DSDT 00000000, 87DF (r1 NVIDIA    MCP67  6040000 MSFT  
3000000)
[    0.452028] ACPI: SSDT ignored due to "acpi_no_auto_ssdt"

and still waits at 
[    0.588165] ACPI: EC: non-query interrupt received, switching to interrupt 
mode

-- 
acpi hangs on boot
https://bugs.launchpad.net/bugs/254668
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