MicroSD and suspend mode.

ZhangJieJing kzjeef at gmail.com
Wed Jan 27 20:53:43 EST 2010


On Wed, Jan 27, 2010 at 2:24 AM, Lars-Peter Clausen <lars at metafoo.de> wrote:

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> Richard Chávez wrote:
> > Hi,
> >
> > I am using 'echo mem > /sys/power/state' to suspend the nano as
> > mentioned by Lars in a previous message. It works fine but I have
> > found two issues:
> >
> > 1. Sometimes the screen turns whites wich means it will be consumming
> > more energy.
> Hm... this is due to how the lcd works. Apparently all of it's
> internal logic is clocked by the pixel clock. So after sending the
> command sequence to shutdown the display we have to maintain the
> pixelclock some time until the display is finally suspended. This
> isn't so easy without layering violations inside the kernel code, but
> I though I added some quirks to ensure proper behavior.
>

I think it's also because the backlight of LCD is still on,  if the LCD
backlight is off, the LCD isn't looks like a white.


> > 2. If the MicroSD is in the socket, nano doesn't return from suspend
> > if we let it in this mode for over two minutes.
> Did you build your own kernel or are you using the one from
> downloads.qi-hardware.com?
>
> - -Lars
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