netdev - Re: 4.10.9 nok with realtek wlan, atom

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Date:   Sat, 15 Apr 2017 15:40:57 -0500
From:   Larry Finger <Larry.Finger@...inger.net>
To:     rupert THURNER <rupert.thurner@...il.com>
Cc:     Bjorn Helgaas <helgaas@...nel.org>, linux-pci@...r.kernel.org,
        Chaoming Li <chaoming_li@...lsil.com.cn>,
        Kalle Valo <kvalo@...eaurora.org>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: 4.10.9 nok with realtek wlan, atom

On 04/14/2017 03:26 PM, rupert THURNER wrote:
> On Thu, Feb 9, 2017 at 9:09 PM, Larry Finger <Larry.Finger@...inger.net> 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@...ias) (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

Is firmware rtlwifi/rtl8192cfw.bin also used on kernels that work?

Larry