Return-path: Received: from mail-io0-f176.google.com ([209.85.223.176]:36520 "EHLO mail-io0-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752855AbdDNU0r (ORCPT ); Fri, 14 Apr 2017 16:26:47 -0400 MIME-Version: 1.0 From: rupert THURNER Date: Fri, 14 Apr 2017 22:26:25 +0200 Message-ID: (sfid-20170414_222651_631223_43566417) Subject: 4.10.9 nok with realtek wlan, atom To: Larry Finger Cc: Bjorn Helgaas , linux-pci@vger.kernel.org, Chaoming Li , Kalle Valo , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset=UTF-8 Sender: linux-wireless-owner@vger.kernel.org List-ID: On Thu, Feb 9, 2017 at 9:09 PM, Larry Finger wrote: > On 02/09/2017 01:43 PM, Bjorn Helgaas wrote: >> >> [+cc rtl8192ce folks in case they've seen this] >> >> On Thu, Feb 09, 2017 at 03:45:01PM +0100, rupert THURNER wrote: >>> >>> hi, >>> >>> not technical expert enough, i just wanted to give a short user >>> feedback. for realtek wlan on atom, kernels up to 4.9.5 are ok, and >>> kernel 4.10.0-rc7-g926af6273fc6 (arch linux-git version numbering) as >>> well. kernels 4.9.6, 4.9.7, and 4.9.8 fail, i.e. connection to a WLAN >>> hotspot is possible then drops, or connecting to wlan fails >>> alltogether. >> >> >> Thanks very much for your report, and sorry for the inconvenience. >> >> v4.10-rc7 works, so I guess we don't need to worry about fixing v4.10. >> >> But the stable kernels v4.9.6, v4.9.7, and v4.9.8 are broken, so we >> need to figure out why and make sure we fix the v4.9 stable series. >> >> I can't tell yet whether this is PCI-related or not. If it is, >> 4922a6a5cfa7 ("PCI: Enumerate switches below PCI-to-PCIe bridges") >> appeared in v4.9.6, and there is a known issue with that. The issue >> should be fixed by 610c2b7ff8f6 ("PCI/ASPM: Handle PCI-to-PCIe bridges >> as roots of PCIe hierarchies"), which appeared in v4.9.9, so I guess >> the first thing to do would be to test v4.9.9. >> >> If it's not fixed in v4.9.9, can you share the complete dmesg log >> (output of "dmesg" command) and "lspci -vv" output for v4.9.5 (last >> known working version) and v4.9.6 (first known broken version)? On >> v4.9.6, collect the dmesg output after the failure occurs. >> >>> 24: PCI 300.0: 0282 WLAN controller >>> [Created at pci.366] >>> Model: "Realtek RTL8188CE 802.11b/g/n WiFi Adapter" >>> Device: pci 0x8176 "RTL8188CE 802.11b/g/n WiFi Adapter" >>> Revision: 0x01 >>> Driver: "rtl8192ce" >>> Driver Modules: "rtl8192ce" >>> Device File: wlp3s0 >>> Features: WLAN > > > It would be helpful if someone were to bisect this issue. The only issue > that comes to mind was fixed in commit 52f5631a4c05 ("rtlwifi: rtl8192ce: > Fix loading of incorrect firmware") which is in 4.10-rc7 and will be > backported to 4.9. > > The above issue is one that could not be reproduced on my hardware, thus it > took Jurij Smakov to find the fix. Without his bisection of the problem, who > knows how long it would have taken to find my edit mistake. larry, using the newest kernel 4.10.8 the network connection dropps again irregular. # dmesg [ 0.000000] Linux version 4.10.9-1-ARCH (builduser@tobias) (gcc version 6.3.1 20170306 (GCC) ) #1 SMP PREEMPT Sat Apr 8 12:39:59 CEST 2017 [ 11.933373] rtl8192ce: rtl8192ce: Power Save off (module option) [ 11.933396] rtl8192ce: Using firmware rtlwifi/rtl8192cfw.bin [ 11.978307] ieee80211 phy0: Selected rate control algorithm 'rtl_rc' [ 11.978945] rtlwifi: rtlwifi: wireless switch is on # lspci -vv Subsystem: Realtek Semiconductor Co., Ltd. RTL8188CE 802.11b/g/n WiFi Adapter Kernel driver in use: rtl8192ce best, rupert