Hybrid Crossfire configure

[Nimbrant]

Im trying to get hybrid crossfire working if it is even possible with my current setup.

I'm trying to get the integrated hd4250 wirking with a pcie hd 5450.

I've run the following two commands

$ aticonfig --cfa --adapter=all
$ aticonfig --cf on --adapter=all

$ aticonfig --lsa
* 0. 01:05.0 ATI Radeon HD 4250  
  1. 02:00.0 ATI Radeon HD 5450

$ aticonfig --lscc

Master adapter:  0. 01:05.0 ATI Radeon HD 4250  
    Candidates:  1. 02:00.0 ATI Radeon HD 5450

$ aticonfig --lscs
    Candidate Combination: 
    Master: 1:5:0 
    Slave: 2:0:0 
    CrossFire is disabled on current device
    CrossFire Diagnostics:
    Memory bank mismatch on this system
    CrossFire can work with P2P mapping through GART
    System needs a reboot before enable CrossFire

I'm using Ubuntu 10.10 and Catalyst 10.12, rebooting doesn't change anything. I'm not sure what to try next.
Any help would be appreciated.

Thanks