Comment 19 for bug 1295267

Same here on 15.04.
Moreover, app windows become inaccessible, invisible, like moved somewhere away. Extremely annoying.

*-display
       description: VGA compatible controller
       product: 3rd Gen Core processor Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 09
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:29 memory:f0000000-f03fffff memory:e0000000-efffffff ioport:4000(size=64)