Messages in this thread | | | Subject | Re: 2.6.{9,10}: C3 not working once USB driver gets loaded (ThinkPad T40p) | From | Len Brown <> | Date | 27 Dec 2004 21:39:25 -0500 |
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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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