netdev - Re: 4.10.9 nok with realtek wlan, atom

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Message-ID: <CAJs9aZ9Hwnjb60mCycR3T2TWH75ZTdtEeWQ1iHRN+6NkkD+pZA@mail.gmail.com>
Date:   Sun, 16 Apr 2017 12:23:41 +0200
From:   rupert THURNER <rupert.thurner@...il.com>
To:     Larry Finger <Larry.Finger@...inger.net>
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 Sat, Apr 15, 2017 at 10:40 PM, Larry Finger
<Larry.Finger@...inger.net> wrote:
> 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?

4.10.x used to work. 4.10.6 or 4.10.7 it started failing? i am not too
sure about it.

# ls -l /usr/lib/firmware/rtlwifi/rtl8192cfw.bin
-rw-r--r-- 1 root root 16192 Mar 10 12:15
/usr/lib/firmware/rtlwifi/rtl8192cfw.bin

rupert