F. McLion wrote:
Update your graphic card driver to the latest version.
And for a very practical reason from your point of view: using all caps looks like SHOUTING, and people will concentrate more on the SHOUTING than on answering your question. Some will just ignore you for this reason.
If updated drivers don't fix the problem, perhaps you can tell us what is the "PROBLEM WITH LIGHTROOM CC BRUSH WHEN THE GPU IS TURN ON" that you are having.