From: Stanislaw Gruszka <sgruszka@redhat.com>
To: Johannes Berg <johannes@sipsolutions.net>
Cc: Jorge Miguel <jmiggal@gmail.com>, linux-wireless@vger.kernel.org
Subject: Re: Setting my WiFi adhoc connection in power save mode
Date: Fri, 13 May 2011 14:22:36 +0200 [thread overview]
Message-ID: <20110513122235.GC5516@redhat.com> (raw)
In-Reply-To: <1305287703.3487.16.camel@jlt3.sipsolutions.net>
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
next prev parent reply other threads:[~2011-05-13 12:22 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-12 17:02 Setting my WiFi adhoc connection in power save mode Jorge Miguel
2011-05-13 11:50 ` Stanislaw Gruszka
2011-05-13 11:55 ` Johannes Berg
2011-05-13 12:22 ` Stanislaw Gruszka [this message]
2011-05-13 12:27 ` Johannes Berg
2011-05-13 12:39 ` Stanislaw Gruszka
2011-05-13 12:45 ` Johannes Berg
2011-05-13 21:15 ` Jorge Miguel
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