Re: 4.10.9 nok with realtek wlan, atom

[Larry Finger]

On 04/16/2017 05:23 AM, rupert THURNER wrote:
> On Sat, Apr 15, 2017 at 10:40 PM, Larry Finger
> <Larry.Finger@xxxxxxxxxxxx> wrote:
> > On 04/14/2017 03:26 PM, rupert THURNER wrote:
> > > On Thu, Feb 9, 2017 at 9:09 PM, Larry Finger <Larry.Finger@xxxxxxxxxxxx>
> > > 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
> >
> >
> > 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.

Larry