Re: Devices eating too much power [was Re: Some thoughts on suspend/resume development]

[Pavel Machek <pavel-+ZI9xUNit7I@public.gmane.org>]

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On Ne 13-03-05 16:55:11, Adam Belay wrote:
> On Sun, 2005-03-13 at 22:03 +0100, Pavel Machek wrote:
> > > Also we don't really control display brightness.
> > 
> > But display brightness does not really belong here, right?
> 
> No, in some cases it's controlled by a separate ACPI device.

I meant "I do not think we want to control display brightness by
runtime suspend/resume". It may be a kernel job, but not for runtime
suspend/resume. Backlight is really individual setting as much as
power managment one. Even old monitors had brightness/contrast
buttons, even if it did not spare any energy.

> > Serial ports should not eat energy when not opened; fix it in the
> > driver.
> > 
> > What other devices do eat energy?
> 
> Sound cards

Yep, hw should power them down when not opened.

> bridges (PCI, PCMCIA, USB, etc.)

Agreed, bridges are interesting. Other stuff seems to be covered.

								Pavel
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