USB Autosuspension does not work at all

[schmolch]

The Processor is stuck in C2 until uhci_hcd is unloaded.
It does not even matter if /sys/bus/usb/devices/*/power/autosuspend is set to 1 or 2, only unloading the uhci_hcd module allows the cpu to go into C3.

No usb-devices are connected.

[Leann Ogasawara (leannogasawara)]

The Ubuntu Kernel Team is planning to move to the 2.6.27 kernel for the upcoming Intrepid Ibex 8.10 release. As a result, the kernel team would appreciate it if you could please test this newer 2.6.27 Ubuntu kernel. There are one of two ways you should be able to test:

1) If you are comfortable installing packages on your own, the linux-image-2.6.27-* package is currently available for you to install and test.

--or--

2) The upcoming Alpha5 for Intrepid Ibex 8.10 will contain this newer 2.6.27 Ubuntu kernel. Alpha5 is set to be released Thursday Sept 4. Please watch http://www.ubuntu.com/testing for Alpha5 to be announced. You should then be able to test via a LiveCD.

Please let us know immediately if this newer 2.6.27 kernel resolves the bug reported here or if the issue remains. More importantly, please open a new bug report for each new bug/regression introduced by the 2.6.27 kernel and tag the bug report with 'linux-2.6.27'. Also, please specifically note if the issue does or does not appear in the 2.6.26 kernel. Thanks again, we really appreicate your help and feedback.

[schmolch (saschaheid)]

Autosuspend works on both the latest 2.6.27 and 2.6.26.
The CPU goes into C3 with uhci_hcd loaded and even with usb1-devices connected.

Issue resolved, thanks alot :-)

[schmolch (saschaheid)]

I would like to ask a question regarding usb autosuspend.
On another distro (gentoo) i am not able to get autosuspend working with any kernel (up to 2.6.28).
Is there anything additionally to enabling the kernel-option that you guys do in ubuntu, like echo'ing values into /proc/.../usb/... ?