[ltp] poor battery-life on X60T

[Henrique de Moraes Holschuh]

On Fri, 09 Feb 2007, michael@michaelshiloh.com wrote:
> >ehci_hcd is still loaded so usb can be used just fine.

ehci_hcd will only service USB2.0 devices.

> Very interesting. I think I'll have to join that list (yet another mailing
> list...).

linux-acpi is the acpi linux kernel *development* list :-)

> Any idea how uhci_hcd was causing so much power to be consumed?

It keeps doing bus-master activity, and that pesters the CPU into C1 (or C2,
I forget).

Now, I don't know if it should pester the CPU *so* *much* as to not allow it
to ever leave C1.  If it did, no ThinkPad with uhci loaded and internal USB
devices would ever work right.

I think there IS indeed a bug that Michael just worked around, and it might
very well be some crap in the new ACPI DSDTs from Lenovo, or in the Linux
kernel.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh