[Bug 61586] suspend-to-ram high power upon resume + ehci_hcd

[Dave Rosky]

Public bug reported:

Binary package hint: linux-image-2.6.15-27-686

This bug applies to dapper, I haven't tested edgy.

On this laptop (Dell Inspiron 9400), suspend to ram and resume appears
to work, but I noticed that the idle power is much higher upon resume
than before suspending (around 25% higher).  Note, the cpu usage is
normal upon resume (~100% idle), and the C states look normal.

I tried many things, but finally traced the problem down to the USB
system, in particular ehci_hcd.  I tried removing all USB modules before
suspending, and when I resumed, the power was normal.  I then started
re-inserting the USB modules.  I first re-inserted uhci_hcd and the
power stayed normal (and the USB mouse got detected).  I then re-
inserted ehci_hcd and the abnormally high power returned.

I don't know if this is a problem with hardware or with the driver.  Is
there a way of resetting the USB controller hardware after a resume?  If
there is, I can try that.

Dave

** Affects: linux-source-2.6.15 (Ubuntu)
     Importance: Untriaged
         Status: Unconfirmed

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suspend-to-ram high power upon resume + ehci_hcd
https://launchpad.net/bugs/61586