Comment 32 for bug 1242115

I hate to bump up a 3 years old issue, but I have it on Ubuntu 15.10 and I can't find a fix.
It happens all the time, not only after boot.
Tried both Compiz and Unity - on Compiz the entire window is black. On Unity, it has black borders.
I have a presentation tomorrow, and it's 3am now and I still can't fix it :(

Might have happened after update, I should remember to never update but it's too easy to comply...

$ lsb_release -d
Description: Ubuntu 15.10

$ sudo lshw -C video
       product: Mobile 4 Series Chipset Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 07
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:29 memory:fc000000-fc3fffff memory:d0000000-dfffffff ioport:1800(size=8)
  *-display:1 UNCLAIMED
       description: Display controller
       product: Mobile 4 Series Chipset Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2.1
       bus info: pci@0000:00:02.1
       version: 07
       width: 64 bits
       clock: 33MHz
       capabilities: pm bus_master cap_list
       configuration: latency=0
       resources: memory:fc400000-fc4fffff

$ cat /etc/lightdm/lightdm.conf
[SeatDefaults]
autologin-guest=false
autologin-user=oria
autologin-user-timeout=0
autologin-session=lightdm-autologin

$ tail ~/.cache/upstart/unity7.log
unhandled buffer attach event, attachment type 79
unhandled buffer attach event, attachment type 79
unhandled buffer attach event, attachment type 82
unhandled buffer attach event, attachment type 82
unhandled buffer attach event, attachment type 79
unhandled buffer attach event, attachment type 79
unhandled buffer attach event, attachment type 82
unhandled buffer attach event, attachment type 88
unhandled buffer attach event, attachment type 82
unhandled buffer attach event, attachment type 79