Comment 2 for bug 572879

I saw something like this today on my Dell Inspiron 530n desktop computer. It *usually* suspends and resumes fine, but today it waked right up again and this is what I saw in kern.log:

PM: Syncing filesystems ... done.
PM: Preparing system for mem sleep
Freezing user space processes ... (elapsed 0.00 seconds) done.
Freezing remaining freezable tasks ... (elapsed 0.00 seconds) done.
PM: Entering mem sleep
Suspending console(s) (use no_console_suspend to debug)
usbhid 5-2.1:1.0: suspend error -5
pm_op(): usb_dev_suspend+0x0/0x20 returns -5
PM: Device 5-2.1 failed to suspend: error -5
PM: Some devices failed to suspend
PM: resume of devices complete after 217.688 msecs
PM: resume devices took 0.284 seconds
PM: Finishing wakeup.
Restarting tasks ... done.

Interestingly enough, after unplugging all the usb devices except my keyboard, it still didn't work, but when I unplugged the keyboard (the only usb device left), it worked. After replugging, it still works.

For your particular issue, though, you are using an nvidia GPU. This is more likely to be the cause...