Comment 6 for bug 1310023

Same here.
Using HD3000 and GT555M.
When firstly installed nvidia-prime, the nvidia-settings show correct setting of using Nvidia card.
But when I switched to integrated HD3000 and relogined, the discrete card is still working (laptop became really hot) and I cannot switch back to integrated card. After reboot the discrete card even disappeared from lspci and still working.

prime-select gives the same error:
Error: alternatives are not set up properly
Error: nvidia mode can't be enabled

Bumblebee works well.

Ubuntu 14.04
nvidia-prime 0.6.2 with nvidia-331
kernel 3.13.0