On Wed, Aug 01, 2007 at 08:36:20PM +0200, Oliver Neukum wrote:
Am Mittwoch 01 August 2007 schrieb Andreas Jaeger:
Playing with powertop, I got the following suggestion:
Suggestion: Enable the CONFIG_USB_SUSPEND kernel configuration option.
This option will automatically disable UHCI USB when not in use, and may
save approximately 1 Watt of power.
Is this something we should do in our kernel? Or what is the risk for
this? Will it break automatic access to hot-pluggable devices?
It will _not_ break hotplug. But it'll break all non-compliant devices
unless they are in the list list of quirky devices.However, we know
that list is incomplete. But we don't know how incomplete.
As a compromise, we might change the default to enable it only for
devices with drivers in the kernel. That would be a kind of whitelist.
Yeah, I'm a bit leary of adding this to our kernel just yet, it's still
not quite stable on all devices because other operating systems do not
do this and hence, a lot of devices are broken with it :(
So far, the majority seem to be scanners and some printers.
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