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Thread: Wifi dropouts in Karmic

  1. #1
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    Ubuntu 12.10 Quantal Quetzal

    Wifi dropouts in Karmic

    I have frequent wifi dropouts on my Dell XPS M1210 laptop at home when running 9.10.

    In many cases when this happens, the wireless network is still listed in the Network Manager drop-down list, but the system refuses to connect to it. Sometimes it can be "cured" by disabling wireless networking then re-enabling it, but this is hit and miss.

    I've taken a two dumps of portions of syslog when this happens - one when the wifi connects normally, and one where the system is refusing to connect. Hopefully, these may give someone a clue as to what's causing the problem.

    Sitting in the same place in the house running Windows (spit) on the same laptop has no dropout problems, and the fact that NM can actually see the network leads me to believe that there is some other problem going on.

    Any help and advice gratefully received!

    Trevor
    Attached Files Attached Files

  2. #2
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    Re: Wifi dropouts in Karmic

    Some additional info on my dropout problem:

    Output from lspci:
    00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express Memory Controller Hub (rev 03)
    00:01.0 PCI bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express PCI Express Root Port (rev 03)
    00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 01)
    00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 1 (rev 01)
    00:1c.1 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 2 (rev 01)
    00:1c.3 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 4 (rev 01)
    00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #1 (rev 01)
    00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #2 (rev 01)
    00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #3 (rev 01)
    00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #4 (rev 01)
    00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller (rev 01)
    00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e1)
    00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 01)
    00:1f.2 IDE interface: Intel Corporation 82801GBM/GHM (ICH7 Family) SATA IDE Controller (rev 01)
    00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller (rev 01)
    01:00.0 VGA compatible controller: nVidia Corporation G72M [GeForce Go 7400] (rev a1)
    03:00.0 Ethernet controller: Broadcom Corporation BCM4401-B0 100Base-TX (rev 02)
    03:01.0 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller
    03:01.1 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 19)
    03:01.2 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host Adapter (rev 0a)
    03:01.3 System peripheral: Ricoh Co Ltd xD-Picture Card Controller (rev 05)
    0c:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection (rev 02)


    Also, whenever I try to copy files (using Nautilus) from this laptop to the house server (also running 9.10), the copy process stops after only a few Kb have been copied and the wifi jams up.

    The server is connected to the network via a wired connection and remains active, but the laptop has to be put through all the NM stops/starts/reboots until it connects again.

    Trevor

  3. #3
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    Re: Wifi dropouts in Karmic

    I have a Dell XPS 1530 and experience similar problems using WICD over network manager seamed to help but I still get random disconnects a lot and often have to reboot my laptop to reconnect.
    "Don't Panic"

  4. #4
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    Re: Wifi dropouts in Karmic

    Thanks - I tried WICD but it made little difference so switched back to NM.

    I think the key messages in my syslog are the ones that suddenly crop up which read "Failed to initiate AP scan". I can't understand why this can't be done.

  5. #5
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    Re: Wifi dropouts in Karmic

    Where did you find those logs I want to check mine too.
    "Don't Panic"

  6. #6
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    Re: Wifi dropouts in Karmic

    I am also having a similar problem. I have an XPS M170 with Ubuntu 9.10 newly installed. I had the same problem when I had the 8.1 version installed. I wiped my drive and installed 9.10 from scratch. No upgrade.

    I can browse the web but when I start to download something my netgear router looses its connection. My wifi shows that I still have a connection but it stops downloading. The only way to fix the issue is to cut power to my router and plug it back in. I haven't had this problem with my mac or any of my windows machines but when ubuntu causes my router to crash i lose wireless to everything until I restart the router. Earlier this evening I took this laptop to a friends who also has comcast and the same netgear wireless rangemax router as I and couldn't replicate this problem. Seems to be a problem with a router setting.

    I originally had this same issue about a year ago with 8.1 which I never resolved. I would really like to continue using linux but I cant live with this issue. Any help would be appreciated.

  7. #7
    Join Date
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    Re: Wifi dropouts in Karmic

    Quote Originally Posted by zaphod777 View Post
    Where did you find those logs I want to check mine too.
    System > Administration > Log File Viewer. Then select "syslog" in the lefthand list.

    You need to scroll to the bottom of the list, and watch out for new messages which cause the list to be refreshed constantly!

    Trevor

  8. #8
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    Re: Wifi dropouts in Karmic

    Quote Originally Posted by ffej123 View Post
    I am also having a similar problem. I have an XPS M170 with Ubuntu 9.10 newly installed. I had the same problem when I had the 8.1 version installed. I wiped my drive and installed 9.10 from scratch. No upgrade.

    <snip>

    Any help would be appreciated.
    I'm using a Belkin router (N+ wireless model) which is running some flavour of Linux (I can telnet into it quite happily) and so in theory at least, shouldn't have problems with my Ubuntu laptops and server - I would have expected more problems when I have to use Windows!

    The syslog messages seem to suggest that one of the NM low level routines is failing somehow - the inability to initiate a scan, and some other messages which contain error numbers tell me that some routine is struggling to cope with a frequent condition as the wifi signal level fluctuate.

    Why this stops me from copying files from my XPS to the server is a real mystery though! I'll see if I can get some better log messages when this happens.

    Trevor

  9. #9
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    Re: Wifi dropouts in Karmic

    I have been trying to get it to flip out on me but for some reason it has been very stable.

    It must know I want to find the problem.
    "Don't Panic"

  10. #10
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    Re: Wifi dropouts in Karmic

    Okay it just bombed out on me this is what i see in the logs

    Jan 2 00:53:49 zaphod kernel: [51988.861701] wlan0: deauthenticated from 00:1d:73:8e:de:98 (Reason: 6)
    Jan 2 00:53:51 zaphod kernel: [51990.843290] wlan0: direct probe to AP 00:1d:73:8e:de:98 (try 1)
    Jan 2 00:53:51 zaphod kernel: [51991.045484] wlan0: direct probe to AP 00:1d:73:8e:de:98 (try 2)
    Jan 2 00:53:51 zaphod kernel: [51991.057015] wlan0: direct probe responded
    Jan 2 00:53:51 zaphod kernel: [51991.057026] wlan0: authenticate with AP 00:1d:73:8e:de:98 (try 1)
    Jan 2 00:53:51 zaphod kernel: [51991.128126] wlan0: authenticated
    Jan 2 00:53:51 zaphod kernel: [51991.128185] wlan0: associate with AP 00:1d:73:8e:de:98 (try 1)
    Jan 2 00:53:51 zaphod kernel: [51991.161978] wlan0: RX ReassocResp from 00:1d:73:8e:de:98 (capab=0x431 status=0 aid=1)
    Jan 2 00:53:51 zaphod kernel: [51991.161987] wlan0: associated
    Jan 2 00:53:54 zaphod kernel: [51994.172671] wlan0: deauthenticated from 00:1d:73:8e:de:98 (Reason: 2)
    Jan 2 00:53:54 zaphod kernel: [51994.349911] wlan0: direct probe to AP 00:1d:73:8e:de:98 (try 1)
    Jan 2 00:53:55 zaphod kernel: [51994.427173] wlan0: direct probe responded
    Jan 2 00:53:55 zaphod kernel: [51994.427185] wlan0: authenticate with AP 00:1d:73:8e:de:98 (try 1)
    Jan 2 00:53:55 zaphod kernel: [51994.469813] wlan0: authenticated
    Jan 2 00:53:55 zaphod kernel: [51994.469867] wlan0: associate with AP 00:1d:73:8e:de:98 (try 1)
    Jan 2 00:53:55 zaphod kernel: [51994.487290] wlan0: RX ReassocResp from 00:1d:73:8e:de:98 (capab=0x431 status=0 aid=1)
    Jan 2 00:53:55 zaphod kernel: [51994.487300] wlan0: associated
    Jan 2 00:53:58 zaphod kernel: [51997.594034] iwlagn 0000:0b:00.0: iwl_tx_agg_start on ra = 00:1d:73:8e:de:98 tid = 0
    Jan 2 00:55:53 zaphod kernel: [52112.576819] wlan0: deauthenticated from 00:1d:73:8e:de:98 (Reason: 6)
    Jan 2 00:55:55 zaphod kernel: [52114.468044] wlan0: direct probe to AP 00:1d:73:8e:de:98 (try 1)
    Jan 2 00:55:55 zaphod kernel: [52114.542968] wlan0: direct probe responded
    Jan 2 00:55:55 zaphod kernel: [52114.542979] wlan0: authenticate with AP 00:1d:73:8e:de:98 (try 1)
    Jan 2 00:55:55 zaphod kernel: [52114.610508] wlan0: authenticated
    Jan 2 00:55:55 zaphod kernel: [52114.610577] wlan0: associate with AP 00:1d:73:8e:de:98 (try 1)
    Jan 2 00:55:55 zaphod kernel: [52114.618293] wlan0: RX ReassocResp from 00:1d:73:8e:de:98 (capab=0x431 status=0 aid=1)
    Jan 2 00:55:55 zaphod kernel: [52114.618302] wlan0: associated
    Jan 2 00:55:58 zaphod kernel: [52117.632166] wlan0: deauthenticated from 00:1d:73:8e:de:98 (Reason: 2)
    Jan 2 00:55:58 zaphod kernel: [52117.806273] wlan0: direct probe to AP 00:1d:73:8e:de:98 (try 1)
    Jan 2 00:55:58 zaphod kernel: [52117.841472] wlan0: direct probe responded
    Jan 2 00:55:58 zaphod kernel: [52117.841483] wlan0: authenticate with AP 00:1d:73:8e:de:98 (try 1)
    Jan 2 00:55:58 zaphod kernel: [52117.870337] wlan0: authenticated
    Jan 2 00:55:58 zaphod kernel: [52117.870395] wlan0: associate with AP 00:1d:73:8e:de:98 (try 1)
    Jan 2 00:55:58 zaphod kernel: [52117.874692] wlan0: RX ReassocResp from 00:1d:73:8e:de:98 (capab=0x431 status=0 aid=1)
    Jan 2 00:55:58 zaphod kernel: [52117.874701] wlan0: associated
    Jan 2 00:56:08 zaphod kernel: [52128.382757] iwlagn 0000:0b:00.0: iwl_tx_agg_start on ra = 00:1d:73:8e:de:98 tid = 0
    Jan 2 00:57:30 zaphod kernel: [52209.728716] wlan0: deauthenticated from 00:1d:73:8e:de:98 (Reason: 6)
    Jan 2 00:57:32 zaphod kernel: [52211.626800] wlan0: direct probe to AP 00:1d:73:8e:de:98 (try 1)
    Jan 2 00:57:32 zaphod kernel: [52211.645198] wlan0: direct probe responded
    Jan 2 00:57:32 zaphod kernel: [52211.645209] wlan0: authenticate with AP 00:1d:73:8e:de:98 (try 1)
    Jan 2 00:57:32 zaphod kernel: [52211.647927] wlan0: authenticated
    Jan 2 00:57:32 zaphod kernel: [52211.647975] wlan0: associate with AP 00:1d:73:8e:de:98 (try 1)
    Jan 2 00:57:32 zaphod kernel: [52211.667272] wlan0: RX ReassocResp from 00:1d:73:8e:de:98 (capab=0x431 status=0 aid=1)
    Jan 2 00:57:32 zaphod kernel: [52211.667282] wlan0: associated
    Jan 2 00:57:33 zaphod kernel: [52213.329083] iwlagn 0000:0b:00.0: iwl_tx_agg_start on ra = 00:1d:73:8e:de:98 tid = 0
    seams to be related to

    https://bugs.launchpad.net/ubuntu/+s...ux/+bug/200500

    http://www.mikegerwitz.com/2008/10/1...-no-proberesp/

    This bug is for Karmic here:
    https://bugs.launchpad.net/ubuntu/+s...ux/+bug/483322

    please everyone post in this bug and maybe we will get a fix.
    no fix that I have found yet.

    Hopefully this will point some smarter than me in the right direction.
    Last edited by zaphod777; January 1st, 2010 at 05:41 PM.
    "Don't Panic"

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