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 -- suspend-to-ram high power upon resume + ehci_hcd https://launchpad.net/bugs/61586 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs