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Re: Setting my WiFi adhoc connection in power save mode

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On Fri, May 13, 2011 at 01:55:03PM +0200, Johannes Berg wrote:
> > Also in kernel 2.6.39, after driver split into iwlegacy, power save
> > is marked as not supported by driver. I wonder it was deliberate action
> > from Intel developers, or just IEEE80211_HW_SUPPORTS_PS is missed by
> > mistake. I'm going to look at this.
> 
> Deliberate. On some platforms/systems, the way the device goes to sleep
> caused DMA trouble or something like that, and the ucode would sysassert
> when it tried to wake itself up. The problem was fairly rare, but of
> course the device wakes up 10 times a second or so ...

It's interesting if PS on 3945 ever works or was broken from very
beginning. I bet it was, on some old kernel, and this issue is similar
case like most of other bugs we have in iwlwifi - something that worked
well was broken by adding new chipsets/features support, but never fixed
again and just masked/disabled instead.
 
Stanislaw
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