I can also confirm this issue. I have a dual gpu Core i7 and Radeon HD6450. When I install fglrx, fglrx-updates or Catalyst 12.9 beta the amd driver does not load.
When using the Radeon card, Unity loads but the Intel driver is used:
$ fglrxinfo
OpenGL vendor string: Intel Inc.
OpenGL renderer string: Intel HD Graphics 3000 OPenGL Engine
OpenGL version string: 1.4 (2.1. APPLE-8.0.61)
I can also confirm this issue. I have a dual gpu Core i7 and Radeon HD6450. When I install fglrx, fglrx-updates or Catalyst 12.9 beta the amd driver does not load.
When using the Radeon card, Unity loads but the Intel driver is used:
$ fglrxinfo
OpenGL vendor string: Intel Inc.
OpenGL renderer string: Intel HD Graphics 3000 OPenGL Engine
OpenGL version string: 1.4 (2.1. APPLE-8.0.61)