Haven't been able to overcome this. Same problem on three different installations: amdconfig --odgt --adapter=all only returns temp for adapter=0, but gives the above error for any and all other GPUs. All cards are mining, lspci |grep VGA correctly identifies all cards. I'm on Ubuntu 14.04, on fresh install of latest AMD crimson drivers with no other apparent issues. Have spent hours googling. Checked everything I could find on this error, but found no coherent diagnosis, let alone a solution. Any ideas? I'm worried about not being able to check temps on all cards.