i have dell inspiron N4010 laptop with broadcomm 4313 wifi chip,and the driver for wifi is installed and i am able to switch on wifi,but it does not detect access points,even ad-hoc networks created to test.I dual booting Ubuntu with windows and i had the same problem with 10.10 before,but a restart with wifi switched has solved the problem but not know.I am including the output of the following commands.
saikiran@saikiran-Inspiron-N4010:~$ sudo lshw -class network *-network description: Wireless interface product: BCM4313 802.11b/g/n Wireless LAN Controller vendor: Broadcom Corporation physical id: 0 bus info: pci@0000:04:00.0 logical name: wlan0 version: 01 serial: 70:f1:a1:8b:7a:38 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless configuration: broadcast=yes driver=brcmsmac driverversion=3.0.0-12-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11bgn resources: irq:17 memory:f0300000-f0303fff *-network description: Ethernet interface product: AR8152 v1.1 Fast Ethernet vendor: Atheros Communications physical id: 0 bus info: pci@0000:05:00.0 logical name: eth0 version: c1 serial: b8:ac:6f:5a:6f:a6 capacity: 100Mbit/s width: 64 bits clock: 33MHz capabilities: pm msi pciexpress vpd bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=atl1c driverversion=126.96.36.199-NAPI firmware=N/A latency=0 link=no multicast=yes port=twisted pair resources: irq:45 memory:f0200000-f023ffff ioport:3000(size=128) saikiran@saikiran-Inspiron-N4010:~$ iwconfig lo no wireless extensions. eth0 no wireless extensions. wlan0 IEEE 802.11bgn ESSID:off/any Mode:Managed Access Point: Not-Associated Tx-Power=19 dBm Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off ppp0 no wireless extensions. saikiran@saikiran-Inspiron-N4010:~$ rfkill list 0: dell-wifi: Wireless LAN Soft blocked: no Hard blocked: no 1: dell-bluetooth: Bluetooth Soft blocked: no Hard blocked: no 2: phy0: Wireless LAN Soft blocked: no Hard blocked: no 3: hci0: Bluetooth Soft blocked: no Hard blocked: no saikiran@saikiran-Inspiron-N4010:~$ sudo iwlist scan [sudo] password for saikiran: lo Interface doesn't support scanning. eth0 Interface doesn't support scanning. wlan0 No scan results ppp0 Interface doesn't support scanning.
does ubuntu scan for networks at the time of boot?
UPDATE:I reinstalled the OS,while trying liveCD wifi is working and detecting AP(access points) without installing properiteries drivers.after installing the same problem recurred.
UPDATE:I reinstalled the OS and driver and also installed ia32-libs,suddenly wifi detects access points,but some what erratic and have to restart with wifi off whenever it does not detect.Sometimes when you switch off and on wifi,it is saying device not ready and i have to restart to make it work.Can anyone explain the debacle.