MicroSD and suspend mode.

Richard Chávez rjchavezb at gmail.com
Fri Feb 5 12:15:35 EST 2010


I would like to get some guidance about how to debug the suspend operation.

I really need to suspend Ben and my application runs using and SDcard.

Perhaps there is someone out here who can help me. I would appreciate it.


2010/1/26 Lars-Peter Clausen <lars at metafoo.de>:
> Hash: SHA1
> 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.
>> 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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