On 09/12/2013 05:24 PM, Timothy Rundle wrote:
>
> I finally got some free time to go through all the patches. My results were
> similar to Mark's, but I do not get the watchdog messages, though I am pretty
> sure watchdog is disabled on my PC. I did even try installing openSUSE 12.3, but
> did not have any success. It didn't even find my wireless network. I manually
> configured the network via network-manager, but still no luck.
>
> Let me know if you need anything else from me.

The watchdog in rtl8192cu has nothing to do with any kernel watchdog timers.
They are totally separate.

Larry

2013-09-19 00:42:14

by Timothy Rundle

[permalink] [raw]

Subject: Re: RTL8192CU continually reconnecting

I found that if I setup a old wireless router as a repeater and keep
it within 10-12 feet I have a stable connection. If I move it back to
12-15 the connection becomes less reliable. Anything past 15 feet is
unusable.

I see there have been lots of conversations on the topic and you are
working on some power management changes. If you need me to do any
testing let me know.

Timothy

On Fri, Sep 13, 2013 at 1:52 PM, Larry Finger <[email protected]> wrote:
> On 09/12/2013 05:24 PM, Timothy Rundle wrote:
>>
>>
>> I finally got some free time to go through all the patches. My results
>> were
>> similar to Mark's, but I do not get the watchdog messages, though I am
>> pretty
>> sure watchdog is disabled on my PC. I did even try installing openSUSE
>> 12.3, but
>> did not have any success. It didn't even find my wireless network. I
>> manually
>> configured the network via network-manager, but still no luck.
>>
>> Let me know if you need anything else from me.
>
>
> The watchdog in rtl8192cu has nothing to do with any kernel watchdog timers.
> They are totally separate.
>
> Larry
>
>

2013-09-09 15:08:08

by Oleksij Rempel

[permalink] [raw]

Subject: Re: RTL8192CU continually reconnecting

Am 09.09.2013 16:57, schrieb Larry Finger:
> On 09/09/2013 09:16 AM, Mark Cave-Ayland wrote:
>> On 09/09/13 00:16, Larry Finger wrote:
>>
>>> On 09/08/2013 06:53 AM, Timothy Rundle wrote:
>>>> My TL-WN821N with a RTL8192CU chipsets fails to stay connected. It
>>>> appears to be disconnecting every 5-10 seconds. Since the issue
>>>> happens with the mainline kernel, the downstream maintainer ask me to
>>>> post here. Here is a section of my kernel log:
>>>
>>> This problem has been reported before; however, I cannot duplicate it on
>>> my openSUSE KDE system that controls the wireless using NetworkManager.
>>
>> Yes, this sounds like exactly the same problem that I reported a
>> couple of weeks
>> ago. Note that I see the issue invoking wpa_supplicant manually rather
>> than
>> using NetworkManager, so I don't think that this is part of the problem.
>>
>> I can also clarify that if I remove *all* entries from
>> wpa_supplicant.conf
>> except for the one AP I'm trying to associate with, then I can
>> generally get an
>> initial association within about 30-60s. However I still repeatedly see
>> drop-outs every 30s or so.
>
> I think your user space is exactly the problem. As I am writing this, my
> device, which lsusb reports as "ID 7392:7811 Edimax Technology Co., Ltd
> EW-7811Un 802.11n Wireless Adapter [Realtek RTL8188CUS]" has been up for
> a little over 20 hours. During that time, there have been 23
> deauthentications for reason 7, but 0 of the "connection to AP lost"
> variety.
>
> My system is running version 1.1 of wpa_supplicant, 0.9.6.4 of
> NetworkManager, and 0.9.0.7 of the KDE applet.
>
> None of my wireless connections are made automatically. When I select a
> particular AP from the KDE applet, it is roughly 2 seconds until the
> interface has gotten an IP and reports its state as connected.
>
> I will switch my system from NM to manual control to see what happens.
>
> Larry

Just in case:
There can be some usb issue. At least i need to fight right now with
some of them on ath9k_htc.

--
Regards,
Oleksij

2013-09-09 14:57:04

by Larry Finger

[permalink] [raw]

Subject: Re: RTL8192CU continually reconnecting

On 09/09/2013 09:16 AM, Mark Cave-Ayland wrote:
> On 09/09/13 00:16, Larry Finger wrote:
>
>> On 09/08/2013 06:53 AM, Timothy Rundle wrote:
>>> My TL-WN821N with a RTL8192CU chipsets fails to stay connected. It
>>> appears to be disconnecting every 5-10 seconds. Since the issue
>>> happens with the mainline kernel, the downstream maintainer ask me to
>>> post here. Here is a section of my kernel log:
>>
>> This problem has been reported before; however, I cannot duplicate it on
>> my openSUSE KDE system that controls the wireless using NetworkManager.
>
> Yes, this sounds like exactly the same problem that I reported a couple of weeks
> ago. Note that I see the issue invoking wpa_supplicant manually rather than
> using NetworkManager, so I don't think that this is part of the problem.
>
> I can also clarify that if I remove *all* entries from wpa_supplicant.conf
> except for the one AP I'm trying to associate with, then I can generally get an
> initial association within about 30-60s. However I still repeatedly see
> drop-outs every 30s or so.

I think your user space is exactly the problem. As I am writing this, my device,
which lsusb reports as "ID 7392:7811 Edimax Technology Co., Ltd EW-7811Un
802.11n Wireless Adapter [Realtek RTL8188CUS]" has been up for a little over 20
hours. During that time, there have been 23 deauthentications for reason 7, but
0 of the "connection to AP lost" variety.

My system is running version 1.1 of wpa_supplicant, 0.9.6.4 of NetworkManager,
and 0.9.0.7 of the KDE applet.

None of my wireless connections are made automatically. When I select a
particular AP from the KDE applet, it is roughly 2 seconds until the interface
has gotten an IP and reports its state as connected.

I will switch my system from NM to manual control to see what happens.

Larry

2013-09-12 23:02:55

by Timothy Rundle

[permalink] [raw]

Subject: Re: RTL8192CU continually reconnecting

I finally got some free time to go through all the patches. My results
were similar to Mark's, but I do not get the watchdog messages, though
I am pretty sure watchdog is disabled on my PC. I did even try
installing openSUSE 12.3, but did not have any success. It didn't
even find my wireless network. I manually configured the network via
network-manager, but still no luck.

Let me know if you need anything else from me.

On Wed, Sep 11, 2013 at 4:09 PM, Larry Finger <[email protected]> wrote:
> On 09/10/2013 03:04 PM, Mark Cave-Ayland wrote:
>
>> Interesting. Perhaps there is something different in the initial
>> programming of
>> the radio that causes it to crash on my particular hardware revision? As
>> before,
>> please let me know if there is anything else you require.
>
>
> From the log data, you have the same revision as I do.
>
> I am now running a kernel built with your configuration. I needed to make a
> couple of changes as it did not have one of the modules my disk system
> needs, and nouveau caused kernel panics, but we are now operational. Outside
> of the whole system being slow due to only one 2.0 GHz CPU, the wireless
> connection seems to be stable. At least, there have been no disconnects in
> the first half hour.
>
> Larry
>
>

2013-09-09 17:04:07

On 10/09/13 03:52, Larry Finger wrote:

> We now know that the beacons are being lost. The last one was at
> 90600.642566 as shown below:
>
> Sep 10 00:29:48 kentang kernel: [90599.513526] rtlwifi: mode 2, state 2,
> is_beacon 1, is_probe_resp 0, length 153
> Sep 10 00:29:50 kentang kernel: [90600.642566] rtlwifi: mode 2, state 2,
> is_beacon 1, is_probe_resp 0, length 153
> Sep 10 00:29:57 kentang kernel: [90607.829051]
> rtlwifi:rtl_watchdog_wq_callback():<0-0> AP off, try to reconnect now
> Sep 10 00:29:57 kentang kernel: [90607.829058] wlan1: Connection to AP
> 00:1f:9f:d5:a8:3b lost
> Sep 10 00:29:57 kentang kernel: [90607.830086] cfg80211: Calling CRDA to
> update world regulatory domain
>
> We have to conclude that your interface has been shut down as we have
> gotten no beacons or RX data packets received. Unfortunately, my
> restricting the output to only your AP does not let me know if any data
> are being received. I hate to do this, but the attached patch will dump
> all packets again with no limit. Once you get a disconnect, then you can
> stop the run before the log gets too full.

No worries - disk space is reasonably cheap these days ;)

dmesg output:
http://www.ilande.co.uk/tmp/rtl8192cu_patch-4-dmesg.txt

wpa_supplicant output:
http://www.ilande.co.uk/tmp/rtl8192cu_patch-4-wpa_supplicant.txt

I noticed that I got several re-authentication attempts in the dmesg
output without the corresponding rtl_watchdog_wq_callback() line being
emitted - this is again something I don't see with zd1211rw and iwlwifi.
Once these drivers are associated, they seem to stay in that state for
hours.

Whilst checking various parts of my kernel, I noticed for the first time
during testing that my current kernel configuration doesn't have SMP
enabled. This got me thinking that perhaps there are other build options
which could have an effect on the driver. Hence I also uploaded a copy
of my .config file to http://www.ilande.co.uk/tmp/rtl8192cu-config in
the hope that maybe this can help you recreate the issue locally?

ATB,

Mark.