tips mainly for Houdini

OpenCl library confliction

On fedora, software update might install/update openCL library? called "beignet", which causes conflict with the one from Nvidia if you have installed a Nvidia graphic card and driver.

When you launch Houdini and find errors below, probably this conflict is happening:

X server found. dri2 connection failed! 
DRM_IOCTL_I915_GEM_APERTURE failed: Invalid argument
Assuming 131072kB available aperture size.
May lead to reduced performance or incorrect rendering.
get chip id failed: -1 [22]
param: 4, val: 0

So just remove it.

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