Alan Stern wrote:

quoted

quoted

Also, you should run "lspci -vv" as root to see what wakeup signals the 
USB controllers are issuing.

[...]

quoted

00:02.1 USB Controller: nVidia Corporation MCP55 USB Controller (rev a2) (prog-if 20 [EHCI])
	Subsystem: ASUSTeK Computer Inc. Unknown device 8239
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0 (750ns min, 250ns max)
	Interrupt: pin B routed to IRQ 20
	Region 0: Memory at fe02e000 (32-bit, non-prefetchable) [size=256]
	Capabilities: [44] Debug port: BAR=1 offset=0098
	Capabilities: [80] Power Management version 2
		Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME+
	Kernel driver in use: ehci_hcd

The EHCI controller settings, however, are strange.  The relevant part 
is the Power Management Status line near the end:

quoted

		Status: D0 PME-Enable- DSel=0 DScale=0 PME+

This means the controller is in the D0 state (as expected) and 
PME-Enable is currently turned off ("PME" stands for "Power Management 
Event").  But the PME+ at the end means that as soon as PME does get 
enabled -- like when the controller is suspended at the start of a 
system sleep -- it _will_ send a PME signal.

So for some reason your EHCI controller thinks a wakeup event is 
pending.  This means you should examine the contents of the "registers" 
file in the debugfs directory for the EHCI controller, not OHCI.

melchior:/mnt/ehci/0000:00:02.1# cat registers
bus pci, device 0000:00:02.1 (driver 10 Dec 2004)
EHCI Host Controller
EHCI 1.00, hcd state 1
ownership 00000001
SMI sts/enable 0xc0080000
structural params 0x00101a8a
capability params 0x0000a086
status 0008 FLR
command 010009 (park)=0 ithresh=1 period=256 RUN
intrenable 37 IAA FATAL PCD ERR INT
uframe 3f3a
port 1 status 003400 POWER OWNER sig=k
port 2 status 001000 POWER sig=se0
port 3 status 003400 POWER OWNER sig=k
port 4 status 003400 POWER OWNER sig=k
port 5 status 001000 POWER sig=se0
port 6 status 001000 POWER sig=se0
port 7 status 001000 POWER sig=se0
port 8 status 001000 POWER sig=se0
port 9 status 001000 POWER sig=se0
port 10 status 001000 POWER sig=se0
irq normal 0 err 0 reclaim 0 (lost 0)
complete 0 unlink 0

HTH,

-- 
Tobias						PGP: http://9ac7e0bc.uguu.de
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