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Yesterday I have upgraded to Ubuntu 13.04. After I upgrade, I have a serious problem with network (I use wire network): my network is unstable. After a short time using it, it often disconnects. It means the connected sign on taskbar is normal, but I can not browse the internet anymore.

The only solution that I have is unplug network, and plug again, and network runs smoothly again. I don't know why this happen and I google but no answer.

I'm using laptop with core i5, and network card is onboard.

Here is my network card info after I run command : sudo lshw -C network

*-network               
       description: Wireless interface
       product: AR9285 Wireless Network Adapter (PCI-Express)
       vendor: Atheros Communications Inc.
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: wlan0
       version: 01
       serial: d0:df:9a:e2:81:c7
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=ath9k driverversion=3.8.0-19-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11bgn
       resources: irq:17 memory:c0500000-c050ffff
  *-network
       description: Ethernet interface
       product: AR8151 v2.0 Gigabit Ethernet
       vendor: Qualcomm Atheros
       physical id: 0
       bus info: pci@0000:04:00.0
       logical name: eth0
       version: c0
       serial: e8:9a:8f:b9:af:57
       size: 100Mbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress vpd bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=atl1c driverversion=1.0.1.1-NAPI duplex=full ip=192.168.1.100 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
       resources: irq:49 memory:c0400000-c043ffff ioport:2000(size=128)

And here is my laptop information:

System Information
        Manufacturer: TOSHIBA
        Product Name: Satellite L755
        Version: PSK1YL-006001
        Serial Number: 9B077988W
        UUID: 2690FBA0-D81A-11E0-9FD1-E89A8FB9AF57
        Wake-up Type: Power Switch
        SKU Number: PSK1YL-006001
        Family: Intel_Mobile

Please help me about this issue.

share|improve this question
    
Please tell us your networking setup and what kind of network card you do have. –  schaiba Apr 27 '13 at 15:06
    
can you tell me how to do that. because i'm a newcommer to linux world. thanks :) –  hqt Apr 27 '13 at 15:42
    
but, i meet this problem after upgrade to ubuntu 13.05. before that is normal. Before I use Ubuntu, I use Fedora and still meet this situation :( –  hqt Apr 27 '13 at 15:43
1  
I have a similar problem with wireless on Debian. I think it's a bug in NetworkManager because it goes away when I do` service network-manager restart` I haven't had the time to check if there's been such a bug report though. When the network is down, what happens if you run pgrep dhclient? –  Joseph R. Apr 28 '13 at 2:43
1  
@tokosh Got me... It seems to be a bug and this remains the best explanation (symptom, really) that I can see. FWIW, I no longer have that problem (didn't see it on Debian Wheezy, don't see it on Jessie). –  Joseph R. Jan 22 at 4:43

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