Claymore on Ubuntu 15.04 with AMD R9 280 (for mining Monero)

I am using using Ubuntu 15.04 with an AMD/ATI R9 280. I am trying to get Claymore GPU 9.1 Beta working, which just freezes after it displays the banner:

Code:

zer0alt@minerd:~/miner_14x$ ./pool.bash 
GPU Target Temperature: 75C

????????????????????????????????????????????????????????????????ͻ
?            Claymore CryptoNote GPU Miner  v9.1 Beta            ?
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(Freeze)

I have instlaled installed:

Code:

AMD-APP-SDK-v2.9-1.599.381-GA-linux64 
AMDAPPSDK-2.9-1

Everything seems find. I can see the card using lspci:

Code:

zer0alt@minerd:~$ lspci -nn | grep VGA
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Tahiti PRO [Radeon HD 7950/8950 OEM / R9 280] [1002:679a]

I can also see the card from aticonfig:

Code:

zer0alt@minerd:~$ sudo aticonfig --list-adapters
* 0. 01:00.0 AMD Radeon HD 7900 Series

Anyone have any suggestions? Thanks!