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Moved to Ubuntu 11.10 last week (clean install), and noticed that WiFi connection is highly unstable and slow.

UPDATE Found a solution! https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/836250/comments/42

iperf shows average speed around 150-200 Kb/s

I also tried with my second laptop (Dell Vostro 1520, Broadcom chip) and it works fine - average speed is around 4 Mb/s

So it's not a problem with my WiFi access point or with interfering networks. It was working fine in 11.04 and 10.04, so it's a problem with new 11.10


wlan0     IEEE 802.11abgn  ESSID:"rg"  
      Mode:Managed  Frequency:2.447 GHz  Access Point: BC:AE:C5:C3:E8:F7   
      Bit Rate=81 Mb/s   Tx-Power=15 dBm   
      Retry  long limit:7   RTS thr:off   Fragment thr:off
      Power Management:off
      Link Quality=61/70  Signal level=-49 dBm  
      Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
      Tx excessive retries:4276  Invalid misc:16043   Missed beacon:0


         description: PCI bridge
         product: 82801I (ICH9 Family) PCI Express Port 2
         vendor: Intel Corporation
         physical id: 1c.1
         bus info: pci@0000:00:1c.1
         version: 03
         width: 32 bits
         clock: 33MHz
         capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
         configuration: driver=pcieport
         resources: irq:41 ioport:4000(size=4096) memory:f6900000-f69fffff ioport:f0600000(size=2097152)
            description: Wireless interface
            product: WiFi Link 5100
            vendor: Intel Corporation
            physical id: 0
            bus info: pci@0000:0c:00.0
            logical name: wlan0
            version: 00
            serial: 00:21:5d:e3:a5:2a
            width: 64 bits
            clock: 33MHz
            capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
            configuration: broadcast=yes driver=iwlagn driverversion=3.0.0-12-generic-pae firmware= build 33692 ip= latency=0 link=yes multicast=yes wireless=IEEE 802
            resources: irq:47 memory:f69fe000-f69fffff

Can I fix it somehow?..

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closed as too localized by fossfreedom Feb 28 '12 at 22:35

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