[SOLVED] Linux wireless TERRIBLE performance on HP Probook 6450b

blip · 03-29-2014, 08:40 PM

If possible, try testing it as the only device associated with your AP. When the problem occurs in any case, please post a larger kernel log snippet. That still may not be enough to diagnose the issue, though.

In the past, I've had to use Wireshark capturing in monitor mode to diagnose a couple of buggy AP/station interactions regarding power save functionality. (Unfortunately in one case the workaround was no phones on the buggy AP, and for the other periodically reassociate affected bcm4329/bcm4330-based devices.)

Red Squirrel · 03-30-2014, 06:33 AM

I'm the only one on the AP at the moment. It's just a work DSL that we have here but I'm the only one in the building when working nights or weekends. Here is a bigger dmesg log, noticed a lot of these showing up. Wish these had proper time stamps so I can tell when something happened though.

Code:

59600.136921] wlan0: associated
[60346.496037] cfg80211: Calling CRDA to update world regulatory domain
[60346.501872] cfg80211: World regulatory domain updated:
[60346.501877] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[60346.501881] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[60346.501885] cfg80211:   (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[60346.501888] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[60346.501891] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[60346.501894] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[60349.702236] wlan0: authenticate with d8:6c:e9:35:f8:4f
[60349.712825] wlan0: send auth to d8:6c:e9:35:f8:4f (try 1/3)
[60349.717751] wlan0: authenticated
[60349.718396] wlan0: associate with d8:6c:e9:35:f8:4f (try 1/3)
[60349.722013] wlan0: RX AssocResp from d8:6c:e9:35:f8:4f (capab=0x411 status=0 aid=3)
[60349.724394] wlan0: associated
[62083.469316] cfg80211: Calling CRDA to update world regulatory domain
[62083.475703] cfg80211: World regulatory domain updated:
[62083.475709] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[62083.475713] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[62083.475717] cfg80211:   (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[62083.475720] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[62083.475723] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[62083.475726] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[62086.712352] wlan0: authenticate with d8:6c:e9:35:f8:4f
[62086.723174] wlan0: send auth to d8:6c:e9:35:f8:4f (try 1/3)
[62086.725928] wlan0: authenticated
[62086.727529] wlan0: associate with d8:6c:e9:35:f8:4f (try 1/3)
[62086.731203] wlan0: RX AssocResp from d8:6c:e9:35:f8:4f (capab=0x411 status=0 aid=3)
[62086.737114] wlan0: associated

Right now the packet loss is not as bad though. Seems to come and go.

Red Squirrel · 04-29-2014, 11:08 PM

And today it seems to be ok, in fact I have not seen it get as bad as it was originally. This is very strange, but since the issue has not come back I'll mark it as solved, I can always post again after.

rokytnji · 04-30-2014, 08:41 AM

Sounds like a wifi card overheating issue. If you were skilled enough. You could try re-seating the internal wifi card.
First using a pencil type of eraser to Gently clean the pin contacts of the card or a q-tip ,slightly damp/not sopping/dripping wet, with 90% wood alcohol. Making sure all static is discharged from you body 1st or using a grounding strap.

I am comfortable doing stuff like this on my own gear but I make my money as a mechanic.

I went through the same issue a long time back with a internal wifi card on a Acer Aspire One ZG5.

I turned off internal wireless off using bios and had it running wireless off a short usb wifi stick like this one
It worked OOTB for me and works still.Even on usb 1.1.

Since it is a corp. laptop. That way you do not open it. The usb is yours.
Just something to think about in case this problem resurfaces or gets worse.

Red Squirrel · 04-30-2014, 04:19 PM

Hmm interesting never figured a wifi card made enough heat to overheat and cause issues, but guess in a laptop where everything is so dense it could very well happen if it's heated by other components. It's been running for close to 24h now so I will see when I get to work again today to see if the problem resurfaces. If it does then I'll look at a USB adapter, or I'll just shut down the laptop every night.

Red Squirrel · 06-06-2014, 10:13 PM

Well it started doing it again after a fresh reboot (been off for weeks). It's retardedly slow, in fact I'm typing this from windows because the networking in Linux pretty much just ceased to work completely and everything just times out because of how ridiculously slow it is. If I reboot I can get it to work again but it just gets slower and slower till it stops working.

I know it's not the internet because I did a speedtest with my phone off the same wifi network and it's fine.

NGIB · 06-20-2014, 06:08 AM

I have had very spotty WiFi performance from Buntu 14.04 in general on all of my laptops, it's near unusable on my I-7 with Realtek and not much better on my I-5 with Intel. Not sure what changed from 13.10 to 14.04 regarding general WiFi performance but something sure did. I do not have issues with distros with a different base such as Manjaro, Solydx, or MX-14...

Red Squirrel · 06-27-2014, 04:27 AM

Just got upgraded to a dedicated wired connection, no more wireless!

wankel · 05-11-2015, 03:01 PM

Quote:

Originally Posted by Red Squirrel

Well it started doing it again after a fresh reboot (been off for weeks). It's retardedly slow, in fact I'm typing this from windows because the networking in Linux pretty much just ceased to work completely and everything just times out because of how ridiculously slow it is. If I reboot I can get it to work again but it just gets slower and slower till it stops working.

I know it's not the internet because I did a speedtest with my phone off the same wifi network and it's fine.

I know I'm replying to an age old thread, that's marked "SOLVED" on top of that.

Even so: I followed the thread because I also have this

Code:

02:00.0 Network controller: Intel Corporation Centrino Advanced-N 6200 (rev 35)

in my thinkpad x201t. When I just got it years ago, had the same problems with intermittent connectivity and then dropping. It turned out that (back then) the wireless-N / 802.11n was flaky in combination with this card.

I found a description on how to turn of the wireless-N connectivity and only use wireless-G. Since then I had a reasonable stable, if slower, connection.

I have not looked into the issue since 2011 or so, and I hoped that this thread from 2014 would explain how to get top performance with wireless-N on this card. Sorry that I don't know anymore how to set the card to only using wireless-G, but for anyone out there it might be a pointer. HTH ;-)

Edit: in case someone reads the thread, here's an example of how to turn off wireless-N:

Code:

echo "options iwlwifi 11n_disable=1" | sudo tee /etc/modprobe.d/iwlwifi.conf

Edit2: the guy in that thread did not solve his problem, but in my case it helped ;-)