Comment 10 for bug 1264835

Ok, it looks like you do indeed have hybrid graphics, so that could be the issue - support for support for DRM PRIME rendering was introduced after precise. It is mostly working now but is still being enhanced. If you have a second display connector try using that and see if it works.

Or maybe you just need the support for newer memory controller microcode on your AMD Radeon HD 8670M "Oland" GPU which will be in the upstream 3.15-rc2 kernel.