Comment 7 for bug 576736

It's probably a driver bug, but since you didn't include any config or log files it's not possible to do any analysis to narrow it down.

Please attach your /var/log/Xorg.0.log, /etc/X11/xorg.conf, ~/.config/monitors.xml and the output of `dmesg`. That should at least give us the basic run down of your system so we can determine what the next steps should be. If there's any way you can take a photo of the monitors showing the bars, that would help.

I assume after the boot is over, the oddness goes away?