linux-kernel - 4.10.9 nok with realtek wlan, atom

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Date:   Fri, 14 Apr 2017 22:26:25 +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: 4.10.9 nok with realtek wlan, atom

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

best,
rupert