Since March 2014 I am running Funtoo Linux on one of my main machines. It’s a great distribution, I learn a lot while using it.
Updating always went smoothly until yesterday, when I had troubles for the first time.
I started my computer after the update and couldn’t connect through to my wifi anymore. I wondered what was the reason but didn’t find it fast enough, because I had to go to work. Taking the notebook with me I connect it to the universities LAN and all goes well.
At home again, I try to find the error. I use NetworkManager and nm-applet to configure my connections. nm-applet always gave me an device not present I tried to remember if any configuration files changed during updating. Usually I update like this:
$: emerge --sync
$: emerge -aDNuv world
$: emerge --depclean
$: revdep-rebuild
$: dispatch-conf
I didn’t remember any network related changes during dispatch-conf.
When searching for wlan0 in dmesg the only thing I got was:
IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
I booted into my Debian which is installed alongside Funtoo, in case I break something but need a working environment for work. wifi worked here. Good. It was neither a hardware problem nor was the access point unavailable.
Not wanting to reboot all the time to try things out (I was listening to an audiobook ;D), I chrooted into Funtoo:
$: cd /mnt/funtoo
$: mount -t proc none proc
$: mount --rbind /sys sys
$: mount --rbind /dev dev && cp /etc/resolv.conf etc/
$: chroot /mnt/funtoo /bin/bash -i
I tried an iwlist scan which showed me my access point, seems like network and wifi was generally working, must be an issue of networkmanager or nm-applet.
On IRC I stumbled upon somebody who solved the same problem a day ago. And he advised me to look for changed use flags.
$: emerge -pv networkmanager
These are the packages that would be merged, in order:
Calculating dependencies - ... done!
[ebuild R ] net-misc/networkmanager-0.9.8.10-r1 USE="consolekit dhcpcd introspection nss policykit resolvconf -avahi -bluetooth -connection-sharing -dhclient -gnutls -modemmanager -plugins_openconnect -plugins_openswan -plugins_openvpn -plugins_pptp -plugins_sstp -plugins_vpnc -ppp -systemd {-test} -upower -vala -wext -wifi" 0 k
Ohoh! What’s that -wifi!
Okay let’s see if this flag is useful in general:
$: eix -U wifi
Shows me a bunch of packages which contain this flag, for example Thunderbird. Uh? What will this flag do in Thunderbird? Okay, since I have no idea, I am going for the standard way and change the use flag on a per package basis.
Adding net-misc/networkmanager wifi to /etc/portage/package.use and doing an emerge -aDNuv networkmanager to rebuild the package I solved the problem.
So because netoworkmanager got an additional flag to enable wifi management which was disabled by default my wifi didn’t work anymore. This was the first time I came across a problem like this and I wouldn’t have thought about this before. Let’s keep this in mind!