Bug#770588: Bug#769072: #769191, #770588: nvidia-opencl-icd breaking non-nvidia systems

[Rebecca N. Palmer]

> a better fix might be for whatever sets nvidia
> as default graphics provider to only do so if the hardware is present,
> but I don't know whether that's practical.

The package already has a check in 
http://sources.debian.net/src/nvidia-graphics-drivers/340.46-5/debian/libgl1-nvidia-glx.preinst.in 
that offers to abort an install/upgrade on hardware that is too old for 
the new driver version, but it doesn't warn for hardware that isn't 
Nvidia at all (deliberately, according to the changelog; the warning 
currently suggests using nvidia-legacy-304xx-driver instead, which is 
the right solution for old Nvidia hardware but probably as bad as plain 
nvidia-driver on non-Nvidia hardware).