You have been subscribed to a public bug:
On Thinkpad L540 with intel graphics:
External monitors are not recognized in display settings when plugged
into any dock port.
They *are* recognized after a reboot (not after logout).
After plugging out and the in again they are not recognized.
A monitor plugged in and out of the non-dock VGA is recognized instantly.
After plugging in or out of the non-dock VGA, monitors plugged to dock ports
are recognized (which serves as a crazy workaround for me now).
Everything used to work with 14.10, but stopped with 15.04.
A recent test with 1510 live CD did not fix this.
** Affects: xorg (Ubuntu)
Importance: Low
Status: Incomplete
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[Regression] Thinkpad dock: External monitors not recognized after 15.04 upgrade
https://bugs.launchpad.net/bugs/1530171
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