Comment 2 for bug 1370890

oem@u32:~$ ls /usr/src/nvidia-331-331.89/nv-k*
/usr/src/nvidia-331-331.89/nv-kernel.o

oem@u32:~$ ls /var/lib/dkms/nvidia-331/331.89/build/nv-kernel*
/var/lib/dkms/nvidia-331/331.89/build/nv-kernel.o

but the ".nv-kernel.o.cmd" can't be found inside the whole hdd using nautilus's search function.

Has already been reported by the past:
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-331/+bug/1254994

nv-acpi.c needs to be tweaked:
https://devtalk.nvidia.com/default/topic/644906/linux/331-20-on-3-13-rc1-kernel/