no GPUs usable

mysterymeat@desktop:~/cgminer-2.10.5$ sudo aticonfig --lsa
* 0. 01:00.0 ATI Radeon HD 5800 Series
  1. 04:00.0 ATI Radeon HD 5800 Series
  2. 05:00.0 ATI Radeon HD 5800 Series
  3. 06:00.0 ATI Radeon HD 5800 Series

* - Default adapter
mysterymeat@desktop:~/cgminer-2.10.5$ sudo ./cgminer -n
 [2013-04-04 22:07:24] CL Platform 0 vendor: Advanced Micro Devices, Inc.
 [2013-04-04 22:07:24] CL Platform 0 name: AMD Accelerated Parallel Processing
 [2013-04-04 22:07:24] CL Platform 0 version: OpenCL 1.2 AMD-APP (938.2)
 [2013-04-04 22:07:24] Error -1: Getting Device IDs (num)
 [2013-04-04 22:07:24] clDevicesNum returned error, no GPUs usable
 [2013-04-04 22:07:24] 0 GPU devices max detected