This keeps appearing in the logs when the USB subsystem goes to sleep -

Oct 21 13:48:38 my kernel: [325744.624663] CPU 1 is now offline
Oct 21 13:48:38 my kernel: [325744.624667] SMP alternatives: switching to UP 
code
Oct 21 13:48:38 my kernel: [325745.154953] EXT4-fs (dm-2): re-mounted. Opts: 
errors=remount-ro,commit=600
Oct 21 13:48:41 my kernel: [325748.169840] e1000e: eth0 NIC Link is Up 100 Mbps 
Full Duplex, Flow Control: None
Oct 21 13:48:41 my kernel: [325748.169846] e1000e 0000:0d:00.0: eth0: 10/100 
speed: disabling TSO
Oct 21 13:48:53 my kernel: [325759.279173] SMP alternatives: switching to SMP 
code
Oct 21 13:48:53 my kernel: [325759.288628] Booting Node 0 Processor 1APIC 0x1
Oct 21 13:48:53 my kernel: [325759.288632] smpboot cpu 1: start_ip = 92000
Oct 21 13:48:53 my kernel: [325744.626473] CPU1: Thermal monitoring handled by 
SMI
Oct 21 13:48:53 my kernel: [325759.399333] coretemp coretemp.0: Using relative 
temperature scale!
Oct 21 13:48:53 my kernel: [325759.399349] microcode: CPU1 sig=0x6f2, pf=0x1, 
revision=0x5d
Oct 21 13:48:53 my kernel: [325759.400018] Switched to NOHz mode on CPU #1
Oct 21 13:48:53 my anacron[23739]: Anacron 2.3 started on 2011-10-21
Oct 21 13:48:53 my anacron[23739]: Normal exit (0 jobs run)
Oct 21 13:48:53 my kernel: [325759.828921] EXT4-fs (dm-2): re-mounted. Opts: 
errors=remount-ro,commit=0
Oct 21 13:48:53 my kernel: [325760.068266] usb 1-1.2.5: new full speed USB 
device number 64 using ehci_hcd
Oct 21 13:48:53 my kernel: [325760.140156] usb 1-1.2.5: device descriptor 
read/64, error -32
Oct 21 13:48:54 my kernel: [325760.316067] usb 1-1.2.5: device descriptor 
read/64, error -32
Oct 21 13:48:54 my kernel: [325760.492101] usb 1-1.2.5: new full speed USB 
device number 65 using ehci_hcd
Oct 21 13:48:54 my kernel: [325760.564118] usb 1-1.2.5: device descriptor 
read/64, error -32
Oct 21 13:48:54 my kernel: [325760.740150] usb 1-1.2.5: device descriptor 
read/64, error -32
Oct 21 13:48:54 my kernel: [325760.916190] usb 1-1.2.5: new full speed USB 
device number 66 using ehci_hcd
Oct 21 13:48:55 my kernel: [325761.324017] usb 1-1.2.5: device not accepting 
address 66, error -32
Oct 21 13:48:55 my kernel: [325761.396159] usb 1-1.2.5: new full speed USB 
device number 67 using ehci_hcd
Oct 21 13:48:55 my kernel: [325761.422538] e1000e: eth0 NIC Link is Up 100 Mbps 
Full Duplex, Flow Control: Rx/Tx
Oct 21 13:48:55 my kernel: [325761.422544] e1000e 0000:0d:00.0: eth0: 10/100 
speed: disabling TSO
Oct 21 13:48:55 my kernel: [325761.804018] usb 1-1.2.5: device not accepting 
address 67, error -32
Oct 21 13:48:55 my kernel: [325761.804132] hub 1-1.2:1.0: unable to enumerate 
USB device on port 5

I haven't been able to pinpoint the network going down yet.
Eth1 staus up - bridged with tap0 and tap1
Eth0 goes down - not bridged

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https://bugs.launchpad.net/bugs/875677

Title:
  Kernel Power management turnming off used devices that are in use.

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