I have the exactly same problem as described by Benjamin Humphrey and Leon: my setup is a Lenovo X201 laptop in a docking station, with the monitor attached through Displayport. Graphical chipset as per dmesg : Intel HD Graphics Chipset.
Same error in .xsession-errors, too.
I have the exactly same problem as described by Benjamin Humphrey and Leon: my setup is a Lenovo X201 laptop in a docking station, with the monitor attached through Displayport. Graphical chipset as per dmesg : Intel HD Graphics Chipset.
Same error in .xsession-errors, too.