I had a problem with my Ubuntu 12.04 waking up immediately after going into suspend. I solved the problem by changing the settings in /proc/acpi/wakeup, as suggested in this question: How do I prevent immediate wake up from suspend?.

After changing the settings, the system goes flawlessly into suspend and stays suspended, but after I wake it back up, the settings in /proc/acpi/wakeup are different from what I set them to.

Before going to suspend:

cat /proc/acpi/wakeup
Device  S-state   Status   Sysfs node
SMB0      S4    *disabled  pci:0000:00:03.2
PBB0      S4    *disabled  pci:0000:00:09.0
HDAC      S4    *disabled  pci:0000:00:08.0
XVR0      S4    *disabled  pci:0000:00:0c.0
XVR1      S4    *disabled  
P0P5      S4    *disabled  
P0P6      S4    *disabled  pci:0000:00:15.0
GLAN      S4    *enabled   pci:0000:03:00.0
P0P7      S4    *disabled  pci:0000:00:16.0
P0P8      S4    *disabled  
P0P9      S4    *disabled  
USB0      S3    *disabled  pci:0000:00:04.0
USB2      S3    *disabled  pci:0000:00:04.1
US15      S3    *disabled  pci:0000:00:06.0
US12      S3    *disabled  pci:0000:00:06.1
PWRB      S4    *enabled   
SLPB      S4    *enabled

I tell the system to suspend, and it works as it should. But later after waking it up, the settings are changed to either:

USB0      S3    *disabled  pci:0000:00:04.0
USB2      S3    *enabled   pci:0000:00:04.1
US15      S3    *disabled  pci:0000:00:06.0
US12      S3    *enabled   pci:0000:00:06.1

or

USB0      S3    *enabled   pci:0000:00:04.0
USB2      S3    *enabled   pci:0000:00:04.1
US15      S3    *enabled   pci:0000:00:06.0
US12      S3    *enabled   pci:0000:00:06.1

Any ideas?

Thank you for your response. Unfortunately it did not solve my problem.

all of

/sys/bus/usb/devices/usb1/power/wakeup
/sys/bus/usb/devices/usb2/power/wakeup
/sys/bus/usb/devices/usb3/power/wakeup
/sys/bus/usb/devices/usb4/power/wakeup

as well as

/sys/bus/usb/devices/3-1/power/wakeup

are set to disabled, and the notebook still wakes up by itself right after going to sleep. The only thing it seems to react to are the settings in /proc/acpi/wakeup, which keep changing (resetting) every time i power off/restart my notebook.