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SubjectRe: 2.6.{9,10}: C3 not working once USB driver gets loaded (ThinkPad T40p)
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On Sun, 2004-12-26 at 15:50, Tomas Szepe wrote:
> Hi,
>
> In recent kernels (tried 2.6.9, 2.6.10), after I load the uhci_hcd
> module, the processor never goes to state C3. Unloading the module
> again puts things back to normal. The system is an IBM ThinkPad T40p.
>
> Is the USB driver setting some kinda flag in the ACPI subsystem to
> achieve this behavior intentionally or is this a bug?

It is not a Linux bug -- it is a system hardware architecture flaw.

There is a workaround for this issue called
USB Selective Suspend, which you can google and
read all about. Hopefully we'll have this workaround
available on Linux systems before too long.

cheers,
-Len



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