Debian 8 (Jessie): Não é possível conectar-se ao WIFI após a atualização

Question

Atualizei recentemente meu sistema operacional Debian 8. Desde então, tenho sido incapaz de me conectar ao wifi. LAN funciona apenas OK. Veja abaixo uma amostra da saída do meu comando:

frank@debian8:~$ sudo iwlist wlan0 scan
wlan0     Interface doesn't support scanning.


frank@debian8:~$ sudo iwconfig
lo        no wireless extensions.
eth0      no wireless extensions.


frank@debian8:~$ sudo ifconfig -a
eth0      Link encap:Ethernet  HWaddr 34:e6:d7:1e:50:21  
          inet addr:10.68.77.173  Bcast:10.68.77.255  Mask:255.255.255.128
          inet6 addr: fe80::36e6:d7ff:fe1e:5021/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:9246 errors:0 dropped:0 overruns:0 frame:0
          TX packets:9323 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:7078862 (6.7 MiB)  TX bytes:2001113 (1.9 MiB)
          Interrupt:20 Memory:f7400000-f7420000 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:925 errors:0 dropped:0 overruns:0 frame:0
          TX packets:925 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1 
          RX bytes:104194 (101.7 KiB)  TX bytes:104194 (101.7 KiB)

frank@debian8:~$ lspci -vnn | grep -i net
00:19.0 Ethernet controller [0200]: Intel Corporation Ethernet Connection I218-LM [8086:155a] (rev 04)
02:00.0 Network controller [0280]: Intel Corporation Wireless 7260 [8086:08b1] (rev 73)


frank@debian8:~$ sudo dmesg|grep 'firmw\|wl'
[    4.588961] iwlwifi 0000:02:00.0: firmware: failed to load iwlwifi-7260-17.ucode (-2)
[    4.589058] iwlwifi 0000:02:00.0: Direct firmware load for iwlwifi-7260-17.ucode failed with error -2


frank@debian8:~$ sudo rfkill unblock all ; sudo ip link set wlan0 up
Cannot find device "wlan0"


frank@debian8:~$ lspci -knn | grep Net -A2
02:00.0 Network controller [0280]: Intel Corporation Wireless 7260 [8086:08b1] (rev 73)
    Subsystem: Intel Corporation Dual Band Wireless-AC 7260 [8086:4470]
03:00.0 3D controller [0302]: NVIDIA Corporation GF117M [GeForce 610M/710M/820M / GT 620M/625M/630M/720M] [10de:1140] (rev a1)


frank@debian8:~$ sudo rfkill list
1: dell-wifi: Wireless LAN
    Soft blocked: no
    Hard blocked: no
2: dell-bluetooth: Bluetooth
    Soft blocked: no
    Hard blocked: no
3: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no

Estou usando o DELL Latitude E5440.

ATUALIZAÇÃO:

Mais saída de comando:

frank@debian8:~$ lsmod | grep dell
dell_laptop            20480  0 
dell_smbios            16384  1 dell_laptop
dcdbas                 16384  1 dell_smbios
dell_smm_hwmon         16384  0 
video                  40960  3 dell_laptop,nouveau,i915
dell_smo8800           16384  0 
dell_rbtn              16384  1 
rfkill                 24576  5 bluetooth,dell_laptop,dell_rbtn,cfg80211

    

Answer 1

De acordo com Intel , o Intel® Dual Band Wireless-AC 7260 deve funcionar no kernel versão 4.1 e superior.

Adicione backports ao seu /etc/apt/sources.list :

deb http://deb.debian.org/debian jessie-backports main contrib non-free

salve e instale um novo kernel a partir dos backports:

sudo apt-get update
sudo apt-get install linux-image-4.9.0-0.bpo.3-amd64
sudo reboot
sudo modprobe -r iwlwifi
sudo modprobe iwlwifi

As dependências ausentes devem ser instaladas por meio de apt-get install -t jessie-backports package-name .

    

Answer 2

Instalar o firmware dos backports e executar esses comandos fez isso por mim.

apt-get install -t jessie-backports firmware-iwlwifi
modprobe iwlwifi
rfkill unblock all

Após a reinicialização, consegui usar wlan0 .