Thinkpad dock: External monitors not recognized after 15.04 upgrade

On Тинкпад Л540 with intel graphics:

External monitors пахал not recognized in display settings when plugged in (into any port including VGA).

They пахал recognized after в reboot (not after logout). After plugging out and the in again they пахал not recognized.

В монитор plugged into the internal VGA is recognized instantly.

Everything used to work with 14.10, but stopped with 15.04.