First post here, just thought I could chime in since this issue affects me as well.
Running either "sudo pm-suspend" or the 2nd group of commands fixes this issue under systemd in 15.04. After resuming from a suspend (either from a closed lid or being AFK long enough for it to happen), when my wifi did not reconnect, I tried both commands. For both of them, my computer re-entered suspend, but after pressing a key to resume and entering my password, the wifi reconnected as expected.
First post here, just thought I could chime in since this issue affects me as well.
Running either "sudo pm-suspend" or the 2nd group of commands fixes this issue under systemd in 15.04. After resuming from a suspend (either from a closed lid or being AFK long enough for it to happen), when my wifi did not reconnect, I tried both commands. For both of them, my computer re-entered suspend, but after pressing a key to resume and entering my password, the wifi reconnected as expected.