I've also been seeing this bug in kubuntu for about the last 6 months. The wifi actually works when I come directly out of sleep mode but if the computer screen is allowed to lock then afterwards the wifi is broken and journalctl shows errors of the kind "wlan0: Failed check-sdata-in-driver check, flags: 0x4". I've tried to restart services and modprobe the iwl3945 module but this often crashes the computer. Instead I've found that sending the computer into 'sleep' mode and waking it up will restore the wifi -at least for a while.
$ uname -a ... 3.19.0-26-generic #28-Ubuntu SMP Tue Aug 11 14:16:45 UTC 2015 i686 i686 i686 GNU/Linux -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1457587 Title: wifi crash on wakeup (iwl3945 cfg80211) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1457587/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
