As the title suggests, the latest Catalyst driver on my Radeon HD 7950 system causes a kworker thread to consume 100% CPU 24/7. The open source drivers work perfectly without any such problems.
* Ubuntu 14.04 with kernel 3.13 and Xorg Server 1.15
See Bug 1008 – Catalyst 14.1 - kworker thread consumes 100% of a CPU core for the same issue
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