libertas vs. suspend (was: [IAEP] F11-0.88 os260py)
pgf at laptop.org
Fri Jun 18 07:58:43 EDT 2010
> 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 . 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 laptop.org
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