From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mx1.redhat.com ([209.132.183.28]:35590 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932345Ab1EMMWy (ORCPT ); Fri, 13 May 2011 08:22:54 -0400 Date: Fri, 13 May 2011 14:22:36 +0200 From: Stanislaw Gruszka To: Johannes Berg Cc: Jorge Miguel , linux-wireless@vger.kernel.org Subject: Re: Setting my WiFi adhoc connection in power save mode Message-ID: <20110513122235.GC5516@redhat.com> (sfid-20110513_142257_830749_54A77A48) References: <20110513115030.GB5516@redhat.com> <1305287703.3487.16.camel@jlt3.sipsolutions.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <1305287703.3487.16.camel@jlt3.sipsolutions.net> Sender: linux-wireless-owner@vger.kernel.org List-ID: 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