http://bugzilla.kernel.org/show_bug.cgi?id=14669





--- Comment #19 from Len Brown <[email protected]>  2009-11-26 05:24:26 ---
> The black screen is indeed related to intelfb

lets ignore intelfb's black screen issue.
intelfb simply is not interesting.

> irqpoll

lets ignore the acpi=off interrupt issue too --
the test achieved its purpose.

> dmesg (intelfb, acpi=on)
> dmesg (intelfb, acpi=off)

The dmesg in comment #12 and comment #13 clearly show that the
"PM: Adding info for pci" slow-down happens only when ACPI is enabled.

acpi=off:

[    0.019787] PM: Adding info for pci:0000:00:00.0
[    0.019827] PM: Adding info for pci:0000:00:02.0
[    0.019864] PM: Adding info for pci:0000:00:02.1
[    0.019901] PM: Adding info for pci:0000:00:1a.0
[    0.019937] PM: Adding info for pci:0000:00:1a.1
[    0.019973] PM: Adding info for pci:0000:00:1a.7
[    0.020022] PM: Adding info for pci:0000:00:1b.0
[    0.020061] PM: Adding info for pci:0000:00:1c.0
[    0.020098] PM: Adding info for pci:0000:00:1c.1
[    0.020134] PM: Adding info for pci:0000:00:1c.2
[    0.020170] PM: Adding info for pci:0000:00:1d.0
[    0.020209] PM: Adding info for pci:0000:00:1d.1
[    0.020246] PM: Adding info for pci:0000:00:1d.2
[    0.020283] PM: Adding info for pci:0000:00:1d.7
[    0.020319] PM: Adding info for pci:0000:00:1e.0
[    0.020359] PM: Adding info for pci:0000:00:1f.0
[    0.020396] PM: Adding info for pci:0000:00:1f.1
[    0.020433] PM: Adding info for pci:0000:00:1f.2
[    0.020470] PM: Adding info for pci:0000:00:1f.3
[    0.020509] PM: Adding info for pci:0000:02:00.0


acpi enabled:

[    0.754070] PM: Adding info for pci:0000:00:00.0
[    0.955069] PM: Adding info for pci:0000:00:02.0
[    1.156067] PM: Adding info for pci:0000:00:02.1
[    1.357070] PM: Adding info for pci:0000:00:1a.0
[    1.558072] PM: Adding info for pci:0000:00:1a.1
[    1.759070] PM: Adding info for pci:0000:00:1a.7
[    1.960070] PM: Adding info for pci:0000:00:1b.0
[    2.161070] PM: Adding info for pci:0000:00:1c.0
[    2.362071] PM: Adding info for pci:0000:00:1c.1
[    2.563071] PM: Adding info for pci:0000:00:1c.2
[    2.764071] PM: Adding info for pci:0000:00:1d.0
[    2.965075] PM: Adding info for pci:0000:00:1d.1
[    3.166072] PM: Adding info for pci:0000:00:1d.2
[    3.367072] PM: Adding info for pci:0000:00:1d.7
[    3.568072] PM: Adding info for pci:0000:00:1e.0
[    3.769075] PM: Adding info for pci:0000:00:1f.0
[    3.970072] PM: Adding info for pci:0000:00:1f.1
[    4.171073] PM: Adding info for pci:0000:00:1f.2
[    4.372073] PM: Adding info for pci:0000:00:1f.3
[    4.372091] PM: Adding info for pci:0000:02:00.0

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