The issue could be reproduced on Lenovo E450, CID 201407-15368 with 14.04.2 (utopic) Lenovo E450, CID 201408-15472 with 14.04.2 (utopic) Lenovo E555, CID 201411-16166 with 14.04.2 (utopic)
$ acpi_listen
button/wlan WLAN 00000080 00000000 K
The issue could be reproduced on
Lenovo E450, CID 201407-15368 with 14.04.2 (utopic)
Lenovo E450, CID 201408-15472 with 14.04.2 (utopic)
Lenovo E555, CID 201411-16166 with 14.04.2 (utopic)
$ acpi_listen
button/wlan WLAN 00000080 00000000 K