libertas vs. suspend (was: [IAEP] F11-0.88 os260py)

Paul Fox pgf at
Fri Jun 18 07:58:43 EDT 2010

sascha wrote:
 > Excerpts from Bernie Innocenti's message of Fri Jun 18 03:26:56 +0000 2010:
 > >  * Disconnects from network on power save. This is a long-standing
 > >    kernel bug. In 0.84, we "fixed" it by disabling power management.
 > I'm not sure what you're seeing is really a kernel bug (unless you don't 
 > ship the latest OLPC kernel).
 > It works fine for me even across several hundred suspend/resume cycles 
 > (it gets woken about once per 1-2 minutes by IGMP queries from the AP), 
 > though this is with an otherwise unused WLAN, so rekeyings are infrequent. 
 > And rekeyings might be exactly what's causing you trouble: According to 
 > Dan Williams, the libertas chip doesn't wake us for these [1]. I haven't 
 > had time to verify that yet.
 > Upgrading to the latest NetworkManager version might also improve things
 > a lot.

sascha confirmed on IRC that the above refers to XO-1.5 (and is
good news on that front, of course).  but bernie's referring to
XO-1 behavior.  i've been looking at the XO-1 issues recently,
and my progress has been investigative, without a lot of actual
discovery. :-)  i think there are several issues, at least a
couple of which have to do with races between suspend/resume and
other driver activity.  (e.g.  #10176)

 paul fox, pgf at

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