Autosuspend/wakeup every 30 seconds?

With 2.6.21-rc2 I get this in my logs every 30 seconds:

[  772.934864] usb usb4: usb auto-resume
[  772.934898] usb usb4: finish resume
[  772.934966] hub 4-0:1.0: hub_resume
[  772.934987] usb usb4: wakeup_rh
[  772.966732] hub 4-0:1.0: state 7 ports 2 chg 0000 evt 0000
[  772.967421] usb 5-2: usb auto-resume
[  772.992747] uhci_hcd 0000:00:1d.3: port 2 portsc 00a5,01
[  773.003725] usb 5-2: finish resume
[  773.005634] usb usb1: usb auto-resume
[  773.005684] usb usb1: finish resume
[  773.005963] hub 1-0:1.0: hub_resume
[  773.005978] ehci_hcd 0000:00:1d.7: resume root hub
[  773.036728] hub 1-0:1.0: state 7 ports 8 chg 0000 evt fe00
[  773.036986] usb 1-5: usb auto-resume
[  773.062852] ehci_hcd 0000:00:1d.7: GetStatus port 5 status 001005 POWER sig=se0 PE CONNECT
[  773.073724] usb 1-5: finish resume
[  773.074239] hub 1-5:1.0: hub_resume
[  773.074281] ehci_hcd 0000:00:1d.7: reused qh de3f1100 schedule
[  773.074287] usb 1-5: link qh256-0001/de3f1100 start 255 [1/0 us]
[  773.074379] hub 1-5:1.0: state 7 ports 4 chg 0000 evt 0000
[  773.076105] usb 1-5.1: usb auto-resume
[  773.112723] usb 1-5.1: finish resume
[  773.956716] usb usb4: suspend_rh (auto-stop)
[  774.966693] hub 4-0:1.0: hub_suspend
[  774.966701] usb usb4: suspend_rh
[  774.966704] usb usb4: usb auto-suspend
[  775.006266] usb 5-2: usb auto-suspend
[  775.113067] usb 1-5.1: usb auto-suspend
[  777.123656] hub 1-5:1.0: hub_suspend
[  777.123664] usb 1-5: unlink qh256-0001/de3f1100 start 255 [1/0 us]
[  777.123904] usb 1-5: usb auto-suspend
[  779.134627] hub 1-0:1.0: hub_suspend
[  779.134635] ehci_hcd 0000:00:1d.7: suspend root hub
[  779.134663] usb usb1: usb auto-suspend


Is this behavour normal, or should the wakeups be investigated?

Fred.


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