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I am using Ubuntu 11.10. My wireless connections drops 10-20 minutes after I start my computer. It keeps searching for wireless after that but does not find it.

The same issue does not occur if I use Windows. I tried to use the solutions of Wireless connection keeps dropping with an Intel 3945ABG card but it did not work. For example, I could not find /iwl3945.conf file in /etc/modprobe.d folder. Also, the "sudo iwconfig wlan0 power off" command did not help me either.

Here are more details of my network:

sudo lshw -C network:

PCI (sysfs)  
  *-network               
       description: Wireless interface

       product: RTL8191SEvB Wireless LAN Controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: wlan0
       version: 10
       serial: f0:7b:cb:a3:99:90
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=rtl8192se driverversion=3.0.0-12-generic firmware=N/A ip=172.31.51.68 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
       resources: irq:17 ioport:2000(size=256) memory:f0600000-f0603fff

sudo lsmod | grep iwl:

iwl3945                73329  0 
iwl_legacy             71499  1 iwl3945
mac80211              272785  2 iwl3945,iwl_legacy
cfg80211              172392  3 iwl3945,iwl_legacy,mac80211

Any suggestion will be very appreciated.

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You don't need a fix for an Intel card since you have a Realtek. The file you created is ineffective, so remove it: sudo rm /etc/modprobe.d/iwl3945.conf; sudo modprobe -r iwl3945. Then wait for it to disconnect and then run and post: dmesg | grep rtl. Post it here if it is very long and give us the link: paste.ubuntu.com –  chili555 May 14 '13 at 13:14
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1 Answer

I have a Similar problem but with Realtek , rtl8191sevb and my driver is rtl8192se. The problem started after Ubuntu updates a month ago or so...

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