MicroSD and suspend mode.
lars at metafoo.de
Tue Jan 26 13:24:46 EST 2010
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Richard Chávez wrote:
> 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.
> 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
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