linux-kernel - Re: 4.10.9 nok with realtek wlan, atom

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Message-ID: <CAJs9aZ_QRgqAjt+6FV=ZkPvYvkDedwtegMKC4Dk-uT8KtrE-mA@mail.gmail.com>
Date:   Sun, 16 Apr 2017 20:09:13 +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 Sun, Apr 16, 2017 at 6:02 PM, Larry Finger <Larry.Finger@...inger.net> wrote:
> On 04/16/2017 05:23 AM, rupert THURNER wrote:
>>
>> 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
>
>
> That does not answer my question.
4.10, 4.10.2, 4.10.3, 4.10.5 worked. as far as i can tell
rtl8192cfw.bin did not change and was used. with kernels 4.9 there was
a phase where rtl8192cfwU.bin was loaded which did not work. or i do
not understand your question correctly?