Public bug reported:
On my Thinkpad X60s, with the 2.6.24 kernel the idle power consumption
is about 14 watts (with no USB devices connected). When I remove the
uhci_hcd module, power consumption drops to 11.5 watts, improving
battery life significantly.
Powertop also shows that with uhci_hcd the CPU remains in C2 about 60%
of the time, with C3 only at 40%. Without uhci_hcd, the CPU stays in C3
~99% of the time.
Ubuntu versions prior to Hardy didn't seem to have this issue, the power
consumption was lower even with uhci_hcd loaded.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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uhci_hcd causes excessive power consumption
https://bugs.launchpad.net/bugs/223101
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