Return-path: Received: from zimbra.real-time.com ([63.170.91.9]:53194 "EHLO zimbra.real-time.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751123AbbFPCyU (ORCPT ); Mon, 15 Jun 2015 22:54:20 -0400 Date: Tue, 16 Jun 2015 12:53:56 +1000 From: James Cameron To: Larry Finger Cc: Arnaud LE CAM , Jes Sorensen , linux-wireless Subject: Re: [Bug ?] 10ec:b723 Realtek RTL8723BE wireless card drops connection Message-ID: <20150616025356.GC4862@us.netrek.org> (sfid-20150616_045424_856197_CF5E2DDE) References: <1434268591.3014.YahooMailBasic@web172003.mail.ir2.yahoo.com> <557D9966.5050209@lwfinger.net> <20150614230456.GE12739@us.netrek.org> <557E0AB4.2030001@lwfinger.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <557E0AB4.2030001@lwfinger.net> Sender: linux-wireless-owner@vger.kernel.org List-ID: On Sun, Jun 14, 2015 at 06:13:56PM -0500, Larry Finger wrote: > On 06/14/2015 06:04 PM, James Cameron wrote: > >On Sun, Jun 14, 2015 at 10:10:30AM -0500, Larry Finger wrote: > >>To address your problem, power saving does not work correctly on > >>this device. That is why there are numerous posts on the web telling > >>people to use ips=0. It seems that Ubuntu people never look at > >>anything but the Ubuntu literature; however, I'm sure that I posted > >>this "suggestion" there as well. The Realtek group is currently > >>rewriting the entire dynamic management code for all their drivers. > >>When complete, this should improve performance and should help the > >>power-save condition. No, I do not know when the new code will be > >>ready, or how much improvement it will make. > > > >Thanks for summary. > > > >OLPC is also seeing the issue. Power saving mode impacts battery run > >time; one of our design goals. ips=0 seems to solve with 3.19, but > >not fully with 4.1-rc7; still some periods of packet loss. > > > >I offer to test any rtl8723be changes. > > Please do a bisection between 4.1-rc7 and 3.19. Thanks. But I was too hasty in reporting a good result. Now no difference across those kernel versions; still some periods of packet loss with ips=0. Workaround is to use both ips=0 and fwlps=0. We'll ship with that unless we hear of a fix. -- James Cameron http://quozl.linux.org.au/