I think you are misunderstanding the issue - aticonfig lists only one adapter:
aticonfig --list-adapters
* 0. 01:00.0 AMD Radeon HD 6700M Series
Which is the discrete ATI GPU - so its not a bug that when you disable this GPU that it isn't detected.
The integrated GPU is the Intel one and hence can't be read by aticonfig anyway and so again it isn't surprising that aticonfig can't read any temperature when the discrete GPU is disabled.
indicator-sensors hasn't hung either BTW - it just hasn't detected any ATI GPUs when the discrete one is disabled as there is not active ATI GPU to detect and hence no temperature to display.
Closing as invalid, please reopen if you think this is not the case.
I think you are misunderstanding the issue - aticonfig lists only one adapter:
aticonfig --list-adapters
* 0. 01:00.0 AMD Radeon HD 6700M Series
Which is the discrete ATI GPU - so its not a bug that when you disable this GPU that it isn't detected.
The integrated GPU is the Intel one and hence can't be read by aticonfig anyway and so again it isn't surprising that aticonfig can't read any temperature when the discrete GPU is disabled.
indicator-sensors hasn't hung either BTW - it just hasn't detected any ATI GPUs when the discrete one is disabled as there is not active ATI GPU to detect and hence no temperature to display.
Closing as invalid, please reopen if you think this is not the case.