I think my suggestion was a red herring. Did some more testing this afternoon. After removing the option line from/etc/modprobe.d/iwlwifi.conf and rebooting again, wifi still works. So the "fix" seems to be a simple reboot.
I suspect that something is messed up on first boot after updating the kernel. Everything seems fine on subsequent reboots. iwlwifi looks normal in dmesg, and the wifi interface comes up properly now. -- Brad Warkentin -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1180787 Title: Thinkpad X201 iwlwifi module stopped working in latest -21 kernel (OK in -19) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1180787/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
