Comment 5 for bug 1376832

This started happening to me when I upgraded to 15.04 (from 14.04 stepping through 14.10). After several deletions (seemed like every update or every couple boots), I ended up disabling the gpu-manager service and making xorg.conf read-only and sticky for added measure.

gpu-manager only caught my eye because it was taking the most time according to "systemd-analyze blame", about 18 seconds. It was just luck that I killed two birds with one stone by disabling it. I have a geforce 560M with the proprietary driver and no optimus support (though the upgrade installed and tried to enable prime).