Re: Information regarding C3 cpu state and bus mastering activity

Pavel Machek
2005-12-13T14:06:24Z

On Ne 11-12-05 21:10:53, Marco Calviani wrote:
> Hi acpi-devel list,
> I have a problem regarding C3 states and usb. When i'm plugging in any
> usb devices, the my busmaster activity starts couting preventing the
> cpu to go to C3 state. Obviously if i unload all usb-related modules,
> C3 state goes in, my battery lives longer and the laptop stays quiter;
> unfortunately i need an usb-mouse (and possibly also an external USB drive.
> I've read somewhere that this is a specific ACPI standard behaviuor
> but i'm asking if this can be modified in some way, i.d. is it
> possible, with some workarounds, to enter C3 state also with the usb
> modules?

Fix USB to send mouse into runtime-sleep state. That will allow C3 to
be used as long as you are not actively moving the mouse.
Pavel
--
Thanks, Sharp!

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