I'm using Linux Mint 17.3 Rosa in a Dell Inspiron 1525 laptop. Wireless connection has been working for years in this laptop in different linux distros with proprietary Broadcom driver. I formated my computer 14 days ago, and wireless was working fine after that. I have been alternating between cabled and wireless connection. Yesterday, after disconnecting my cable connection, suddenly I could not use wireless anymore. The wifi networks are listed, but I cannot connect to them. I have confirmed (with other computer) that the network is working properly. I checked the packages that were installed or updated since last time wifi was working, and there were none. My kernel version is
$ uname -a Linux mycomputer 3.19.0-32-generic #37~14.04.1-Ubuntu SMP Thu Oct 22 09:37:25 UTC 2015 i686 i686 i686 GNU/Linux
Here is my wireless card:
$ lspci -knn | grep Net -A2 0b:00.0 Network controller : Broadcom Corporation BCM4312 802.11b/g LP-PHY [14e4:4315] (rev 01) Subsystem: Dell Wireless 1395 WLAN Mini-Card [1028:000b] Kernel driver in use: wl
Here is my dmesg output:
$ dmesg | grep wl [ 11.216767] wl: module license 'MIXED/Proprietary' taints kernel. [ 11.225409] wl: module verification failed: signature and/or required key missing - tainting kernel [ 11.476882] wlan0: Broadcom BCM4315 802.11 Hybrid Wireless Controller 184.108.40.206 (r487574)
Here is the output of iwconfig:
$ iwconfig wlan0 IEEE 802.11abg ESSID:"housenet" Mode:Managed Frequency:2.462 GHz Access Point: 20:CF:30:C6:32:A5 Retry short limit:7 RTS thr:off Fragment thr:off Power Management:off lo no wireless extensions. eth0 no wireless extensions.
Here is ip output (I don't know why it has state DORMANT and mode DORMANT):
$ ip link show wlan0 3: wlan0: <NO-CARRIER,BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state DORMANT mode DORMANT group default qlen 1000 link/ether 00:23:4d:a8:e4:77 brd ff:ff:ff:ff:ff:ff
Also, rfkill seems to show no problem.
$ rfkill list all 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no 1: brcmwl-0: Wireless LAN Soft blocked: no Hard blocked: no
I've tried changing the driver from bcmwl-kernel-source to firmware-b43-installer, reboot the computer, but the problem persists. Strangely, the same problem is now happening in the USB-live version of LM 17.3.