My WiFi connection just disappeared. I cannot find any network by GUI, but:
$ iw wlan0 scan
shows nearby networks. Also restarting NetworkManager by few ways (service ... restart or
systemctl stop NetworkManager.service and then disable, enable, start) didn't help.
Using Dell E7440, Debian stretch.
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT group default qlen 1000 link/ether ec:f4:bb:62:af:80 brd ff:ff:ff:ff:ff:ff 3: wwp0s20u7c2i12: <BROADCAST,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN mode DEFAULT group default qlen 1000 link/ether fe:16:26:8b:16:c1 brd ff:ff:ff:ff:ff:ff 4: wlan0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DEFAULT group default qlen 1000 link/ether 5a:62:db:85:8e:84 brd ff:ff:ff:ff:ff:ff
/etc/modprobe.d/ there is no
iwlwifi.conf file, but just
modsetting.conf. (Somebody posted a comment about that but now I can't see it...) I had to add those lines to that:
options iwlwifi 11n_disable=1 swcrypto=1
I made a backup of
modesetting.conf and made
iwlwifi.conf with that commands. Didn't help.
$ nmcli dev status
DEVICE TYPE STATE CONNECTION eth0 ethernet connected eth0 cdc-wdm1 gsm disconnected -- wlan0 wifi unavailable -- lo loopback unmanaged --