[Dextrose] WiFi vs Suspend

forster at ozonline.com.au forster at ozonline.com.au
Tue Aug 24 21:05:19 EDT 2010

Wifi is locked up after resume from sleep, must restart.
I presume this bug is being tracked at dev.laptop.org/ in one of the 4 tickets below

> Where is this on the priority list?  What can I do to help?
> ("Go away until the release is out." might be the right answer.)
> There are (at least) 4 tickets on this:
>   http://dev.laptop.org/ticket/10232  WiFi dies on suspended XO-1, os300
>   http://dev.laptop.org/ticket/10092  Networking broken over suspend/resume 
> on os13 for XO-1
>   http://dev.laptop.org/ticket/9960   wake-on-WLAN doesn't always work 
> (duplicate)
>   http://dev.laptop.org/ticket/9967   ibertas suspend fails on XO-1 (fixed)
> I know about the ARP problem.  I can avoid that by manually setting up the 
> ARP table.
> I see two patterns.  (Most of this should be in 10232.)
> The first case looks like a simple lost interrupt/wakeup.  If so, it should 
> be easy to get some more information.
> The symptoms are that the left WiFi LED is on.  The right WiFi LED blinks 
> when I ping that system but the CPU doesn't wakeup.  Poking the touchpad 
> wakes it up.  Then it starts processing packets.
> I've got the back of a system off.  Is there a handy place to get a 
> scope/meter on the wakeup signal from the WiFi module to the EC?  Is that 
> signal edge triggered or level sensitive?
> The other case has the left WiFi LED off.  The right LED doesn't blink if I 
> ping it.  I can wakeup the system with the touchpad but that doesn't fix the 
> WiFi.  If I shift to the neighborhood view and poke my AP, it disconnects, 
> reconnects, the left LED goes on, and packets work again.
> There is code that occasionally checks the other channels, looking for APs 
> and such.  While that is going on, the left WiFi LED blinks.  What happens if 
> the system suspends when that code is in the middle of switching channels?  
> Where is that code?  Can I easily turn it off?
> -- 
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