[ltp] poor battery-life on X60T

[linux-thinkpad@linux-thinkpad.org]

On Fri, 9 Feb 2007, Sascha Heid wrote:

> Am Freitag, den 09.02.2007, 18:34 +0100 schrieb Sascha Heid:
>>> And something else:
>>> While the Bus-Master-Activity of CPU0 is varying according to the
>>> CPU-Load, the Bus-Master-Activity of CPU1 is always way up (ffffffff
>>> almost always).
>>
>> Today i noticed something funny, the Bus-Master-Activity of CPU1 is
>> still extremely high when the Laptop is idle, but goes down to normal
>> Levels (like CPU0) when i use the Laptop.
>> I got home from work and found the CPU-Temp at 60C (being idle), after
>> using the Laptop for a while it dropped to 44C.
>>
>> Man this is weird, when i compile the kernel with make -j3 the
>> Bus-Master-Activity of both Cores is very low and only then CPU1 drops
>> its temp below that of CPU0.
>>
>> Is this whole thing looking like i have done something terribly wrong
>> somewhere, because i start to wonder?
>
>
> I got the solution from the linux-acpi mailing-list.
> The culprit was uhci_hcd, removing it fixed the BMA Issue, Battery-Life
> raised 1h and temps dropped 5C.
> ehci_hcd is still loaded so usb can be used just fine.

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

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

Michael