AMD has now put out the Catalyst 13.11 Linux Beta v9.4 driver on Friday in order to resolve existing issues. Among the issues fixed are a crash when resizing KDE's Konsole, brightness adjustment issues, kernel module compile issues, avoids using a new GPL symbol, and resolving a system hang to resume from S4 with an OpenGL screen-saver running. There is no reports whether the Radeon R9 290 (Hawaii) series performance has improved.
For those unfamiliar with the current AMD Radeon R9 290 Linux performance issues, see my R9 290 Linux review and the benchmarks for comparative purposes shown within today's NVIDIA GeForce GTX 780 Ti Linux review.
The latest AMD Catalyst Linux driver can be downloaded at AMD.com. New Radeon graphics benchmarks are forthcoming on Phoronix.