(In reply to Comment #29 and #30)

Hi Christopher,

I tested Ubuntu 11.10 without installing it (i.e., Try Ubuntu without
installing) on ASUS P4S8X-MX mainboard.

I will say that Ubuntu 11.10 does not suffer from the USB instant wakeup bug 
that currently exists in Ubuntu 12.04.
Here is what /proc/acpi/wakeup looks like,

$ cat /proc/acpi/wakeup
Device    S-state      Status   Sysfs node
UAR1      S4    *disabled  pnp:00:08
PS2K      S4    *enabled   pnp:00:0c
PS2M      S4    *disabled  pnp:00:0d
EUSB      S3    *disabled  pci:0000:00:03.3
USB      S3    *disabled  pci:0000:00:03.0
USB2      S3    *disabled  pci:0000:00:03.1
USB3      S3    *disabled  pci:0000:00:03.2
AC97      S4    *disabled  pci:0000:00:02.7
MC97      S4    *disabled 
PCI1      S4    *disabled 
PCI2      S4    *disabled 
PCI3      S4    *disabled 
MAC      S4    *disabled  pci:0000:00:04.0

Instant wakeup is not happening because Status for EUSB and USBx devices
are at *disabled state.

In Ubuntu 12.04 (Linux 3.2), they will all be at *enabled state.
Just to confirm the Linux kernel version,

$ uname -r
3.0.0-12-generic

The result here is in line with what Lan Tianyu discussed in Comment #26
of this same bug report I submitted over there at kernel.org.

https://bugzilla.kernel.org/show_bug.cgi?id=47991#c26

Regards,

fpgahardwareengineer

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https://bugs.launchpad.net/bugs/1068393

Title:
  [Ubuntu 12.04.1 LTS 32-bit] SiS chipset USB wakes up the system from
  ACPI S3 State instantaneously bug

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