On Tue, 2009-04-07 at 18:02 +0000, Jeffrey Baker wrote: > > Whether or not they're built in or modules, you can still disable > > individual host control interfaces - the method is just slightly > > different (though since the one that works for built-ins ALSO works for > > modules, we should arguably be documenting that one instead of the > > blacklist trick). > > OK, I should research this. A laptop user can save energy by > unloading the hcd modules, which puts the corresponding PCI functions > into D3. > Actually, the same effect can be achieved by enabling autosuspend on the USB devices (including the hub). See:
http://www.lesswatts.org/projects/devices-power-management/usb.php This is the kind of thing we can't turn on just before release, but I suspect that's a good target for Karmic. > How can you achieve the same thing with the drivers > built-in? > You can disable the host controller itself by unbinding it from the driver, for example: # cd /sys/bus/pci/drivers/ehci_hcd # ls 0000:00:1d.7 bind module new_id uevent unbind # echo -n 0000:00:1d.7 > unbind # ls bind module new_id uevent unbind Scott -- Scott James Remnant [email protected] -- warning: ehci_hcd loaded AFTER uhci_hcd and ohci_hcd https://bugs.launchpad.net/bugs/296710 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
