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Thread: Slow/Dropped Wireless Connection Ubuntu 12.04

  1. #1
    Join Date
    Jul 2008
    Beans
    39

    Question Slow/Dropped Wireless Connection Ubuntu 12.04

    I have an Acer Aspire 5733 setup to dual boot Ubuntu 12.04 & Windows 7. My wireless internet connection under Windows 7 is rock solid, but with Ubuntu the connection is painfully slow or non-existent causing pages not to load or say they are unavailable. Refreshing the page will sometimes reconnect in a few seconds. I get constant errors about connecting in Evolution. I seem to loose connection every few minutes.

    I upgraded from Ubuntu 11.10 last week. I had a similar (although not as bad) connection problem with 11.10. It seems to have gotten worse since the upgrade.

    I'm still fairly new to Ubuntu, so I probably know just enough to get myself into trouble on my own. I know there isn't a problem with the router or wireless card since it works well in Windows, how do I fix the Ubuntu connection?


    ~$ lspci
    00:00.0 Host bridge: Intel Corporation Core Processor DRAM Controller (rev 02)
    00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 02)
    00:16.0 Communication controller: Intel Corporation 5 Series/3400 Series Chipset HECI Controller (rev 06)
    00:1a.0 USB controller: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller (rev 05)
    00:1b.0 Audio device: Intel Corporation 5 Series/3400 Series Chipset High Definition Audio (rev 05)
    00:1c.0 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 1 (rev 05)
    00:1c.1 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 2 (rev 05)
    00:1d.0 USB controller: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller (rev 05)
    00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev a5)
    00:1f.0 ISA bridge: Intel Corporation Mobile 5 Series Chipset LPC Interface Controller (rev 05)
    00:1f.2 SATA controller: Intel Corporation 5 Series/3400 Series Chipset 4 port SATA AHCI Controller (rev 05)
    00:1f.3 SMBus: Intel Corporation 5 Series/3400 Series Chipset SMBus Controller (rev 05)
    00:1f.6 Signal processing controller: Intel Corporation 5 Series/3400 Series Chipset Thermal Subsystem (rev 05)
    01:00.0 Ethernet controller: Broadcom Corporation NetLink BCM57780 Gigabit Ethernet PCIe (rev 01)
    02:00.0 Network controller: Atheros Communications Inc. AR9285 Wireless Network Adapter (PCI-Express) (rev 01)
    ff:00.0 Host bridge: Intel Corporation Core Processor QuickPath Architecture Generic Non-core Registers (rev 02)
    ff:00.1 Host bridge: Intel Corporation Core Processor QuickPath Architecture System Address Decoder (rev 02)
    ff:02.0 Host bridge: Intel Corporation Core Processor QPI Link 0 (rev 02)
    ff:02.1 Host bridge: Intel Corporation Core Processor QPI Physical 0 (rev 02)
    ff:02.2 Host bridge: Intel Corporation Core Processor Reserved (rev 02)
    ff:02.3 Host bridge: Intel Corporation Core Processor Reserved (rev 02)
    ~$ ifconfig
    eth0 Link encap:Ethernet HWaddr b8:70:f4:e8:74:a4
    UP BROADCAST MULTICAST MTU:1500 Metric:1
    RX packets:0 errors:0 dropped:0 overruns:0 frame:0
    TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:1000
    RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
    Interrupt:16

    lo Link encap:Local Loopback
    inet addr:127.0.0.1 Mask:255.0.0.0
    inet6 addr: ::1/128 Scope:Host
    UP LOOPBACK RUNNING MTU:16436 Metric:1
    RX packets:4621 errors:0 dropped:0 overruns:0 frame:0
    TX packets:4621 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:0
    RX bytes:383544 (383.5 KB) TX bytes:383544 (383.5 KB)

    wlan0 Link encap:Ethernet HWaddr d0:df:9a:8f:c5:c7
    inet addr:192.168.2.6 Bcast:192.168.2.255 Mask:255.255.255.0
    inet6 addr: fe80::d2df:9aff:fe8f:c5c7/64 Scope:Link
    UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    RX packets:43840 errors:0 dropped:0 overruns:0 frame:0
    TX packets:40140 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:1000
    RX bytes:42037070 (42.0 MB) TX bytes:7015357 (7.0 MB)
    ~$ iwconfig
    lo no wireless extensions.

    wlan0 IEEE 802.11bgn ESSID:"fuzzypickles"
    Mode:Managed Frequency:2.437 GHz Access Point: 08:86:3B:3B:01:28
    Bit Rate=52 Mb/s Tx-Power=15 dBm
    Retry long limit:7 RTS thr:off Fragment thr:off
    Power Management:on
    Link Quality=70/70 Signal level=-40 dBm
    Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
    Tx excessive retries:34 Invalid misc:1 Missed beacon:0

    eth0 no wireless extensions.

  2. #2
    Join Date
    Apr 2012
    Beans
    6,418

    Re: Slow/Dropped Wireless Connection Ubuntu 12.04

    can you please check the driver with

    Code:
    lshw -c network
    and/or

    Code:
    lspci -vnn | grep -i net
    it should be something like 'ath5k' or 'ath9k'

  3. #3
    Join Date
    Jul 2008
    Beans
    39

    Re: Slow/Dropped Wireless Connection Ubuntu 12.04

    ~$ sudo lshw -c network
    [sudo] password for alayahlan:
    *-network
    description: Ethernet interface
    product: NetLink BCM57780 Gigabit Ethernet PCIe
    vendor: Broadcom Corporation
    physical id: 0
    bus info: pci@0000:01:00.0
    logical name: eth0
    version: 01
    serial: b8:70:f4:e8:74:a4
    size: 10Mbit/s
    capacity: 1Gbit/s
    width: 64 bits
    clock: 33MHz
    capabilities: pm msi pciexpress bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
    configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.121 duplex=half firmware=sb latency=0 link=no multicast=yes port=MII speed=10Mbit/s
    resources: irq:43 memory:d3400000-d340ffff
    *-network
    description: Wireless interface
    product: AR9285 Wireless Network Adapter (PCI-Express)
    vendor: Atheros Communications Inc.
    physical id: 0
    bus info: pci@0000:02:00.0
    logical name: wlan0
    version: 01
    serial: d0:df:9a:8f:c5:c7
    width: 64 bits
    clock: 33MHz
    capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
    configuration: broadcast=yes driver=ath9k driverversion=3.2.0-26-generic-pae firmware=N/A ip=192.168.2.6 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
    resources: irq:17 memory:d2400000-d240ffff
    ~$ lspci -vnn | grep -i net
    01:00.0 Ethernet controller [0200]: Broadcom Corporation NetLink BCM57780 Gigabit Ethernet PCIe [14e4:1692] (rev 01)
    02:00.0 Network controller [0280]: Atheros Communications Inc. AR9285 Wireless Network Adapter (PCI-Express) [168c:002b] (rev 01)
    Is this correct?

  4. #4
    Join Date
    Apr 2012
    Beans
    6,418

    Re: Slow/Dropped Wireless Connection Ubuntu 12.04

    OK I'm not *sure* this fix is still recommended but I believe you can try

    Code:
    sudo modprobe -r ath9k
    
    sudo modprobe ath9k nohwcrypt=1
    if that works we can make it permanent via a conf file

  5. #5
    Join Date
    Jul 2008
    Beans
    39

    Re: Slow/Dropped Wireless Connection Ubuntu 12.04

    Unfortunately, this does not appear to have fixed the problem.
    What is my next step to try?

  6. #6
    Join Date
    Jul 2008
    Beans
    39

    Re: Slow/Dropped Wireless Connection Ubuntu 12.04

    I came across this link and decided to give it a try:
    http://tech.chandrahasa.com/2012/05/...-rule-in-unix/

    Although my country code was set to TW instead of US for some reason, changing this did not appear to change anything.

    I also tried the advice in this thread, again to no avail:
    http://ubuntuforums.org/showpost.php...1&postcount=31

    Every other minute or so, pages fail to load saying DNS lookup failed and Evolution email gives an error claiming it did not have a connection.

  7. #7
    Join Date
    Jul 2012
    Location
    Italy
    Beans
    74
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Slow/Dropped Wireless Connection Ubuntu 12.04

    You can try with this command:
    Code:
    sudo rfkill unblock all
    Bye

  8. #8
    Join Date
    Jul 2008
    Beans
    39

    Re: Slow/Dropped Wireless Connection Ubuntu 12.04

    That didn't work Finnicella.

    Problem is still persisting.

  9. #9
    Join Date
    Jul 2008
    Beans
    39

    Re: Slow/Dropped Wireless Connection Ubuntu 12.04

    I had a USB wireless adapter lying around, so I attempted using it to see if the connection was more stable. I was able to connect using it, but the connection was no better.

  10. #10
    Join Date
    Jul 2012
    Location
    Italy
    Beans
    74
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Slow/Dropped Wireless Connection Ubuntu 12.04

    I found this on the web, I hope will be helpful:

    Code:
    It's the old hwcrypt problem. In case you upgrade the kernel,
    and have no access to the web, don't blame network manager
    or wpasupplicant, create a file named (with sudo gedit)
    
    /etc/modprobe.d/ath9k.conf 
    
    with the contents
    
    options ath9k nohwcrypt=1
    
    and reboot
    Bye

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