The problem is, that sometimes after booting Ubuntu, the wireless connection is not operational (e.g. ping in a console window shows nothing), although the network manager icons shows that connection is established. It is more likely (almost 100%) to happen if the machine hasn't been used for several days (which suggests to me it has something to do with obtaining dhcp leases).
Since the situation does not always happen, I had some trouble to figure out how to exactly reproduce the problem: And even with the steps below, sometimes the wifi will work from the beginning as expected. However, steps that increase the chances to reproduce it are: * boot into ubuntu. * turn off wifi with the rfkill switch * sudo rm /var/lib/dhcp/dhclient* * reboot the system. At the GRUB screen, turn on the rfkill switch again, so that wifi is enabled at boot time * log into ubuntu. network manager will show a "wifi connected" icon (which is not the whole truth). * open up a console window and type "ping www.ubuntu.com". Nothing will be shown on the console Steps to get wifi operational if it does not work after bootup: * turn off rfkill switch. Wait until network manager popped up a message saying "wifi disconnected" * turn it on again Alternative: * boot with wifi disabled by the rfkill switch * turn it on only *after* having logged in to your session Notes: * deleting the dhcp lease seams to be essential to reproduce the fault (well, almost always). If the system boots up and can re-use the current lease, wifi will work properly from the start. The attached syslog contains several boot cycles. In some of them (e.g. the first one) the wifi did not initialize properly, in some others (e.g. the last one) it did. I will also try to install a mainline kernel and report back then. ** Attachment added: "syslog-wlan.tar.gz" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/998805/+attachment/3162610/+files/syslog-wlan.tar.gz -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/998805 Title: Wireless not connecting on bootup in 12.04 (Intel Wifi Link 5100) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/998805/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
