Yet another "Verification failed, check hardware!" problem

Hello, I am experiencing the "check hardware" issue with poclbm, I've already googled and none of the solutions out there work for me.
I am using the latest poclbm (git repo clone), with an ATI GPU (Radeon HD 5450). Also, I do have Crossfire disabled and I am using the -v (vectors) option. Also, I do not overclock at all.

By the way, all submissions will fail the verifcation, none of them are ok.

Code:

# python poclbm.py -d 0 -v -w 128 -f 1 -r 2 http://REDACTED:REDACTED@api.bitcoin.cz:8332
WARNING: no adl3 module found (github.com/mjmvisser/adl3), temperature control is disabled

 15/02/2013 12:49:16, started OpenCL miner on platform 0, device 0 (Cedar)      
 15/02/2013 12:49:16, Setting server (REDACTED @ api.bitcoin.cz:8332)
api.bitcoin.cz:8332 15/02/2013 12:49:16, checking for stratum...                
api.bitcoin.cz:8332 15/02/2013 12:49:17, diverted to stratum on api-stratum.bitcoin.cz:3333
api.bitcoin.cz:8332 15/02/2013 12:49:50, Verification failed, check hardware! (0:0:Cedar, efdd8eab)

Version output:

Code:

# python poclbm.py --version
12.10

aticonfig:

Code:

# aticonfig --lscs
    Candidate Combination: 
    Master: 0:0:0 
    Slave: 0:0:0 
    CrossFire is disabled on current device
    CrossFire Diagnostics:
    CrossFire can work with P2P mapping through GART

I am using Fedora 17 (Beefy Miracle). And I am using propietary GPU drivers.