out of curiosity I installed CUDA 7.5 on a GTX 970 equipped Ubuntu 12.04 system (I know, unsupported configuration…). I tested some of the included CUDA samples, these ran fine.
Interestingly one of our production kernels gave bad computation results after the driver update. The code was compiled for sm_30 with the CUDA 5.0 toolkit, and hence I suspect a problem with the runtime translation onto my GTX 970 GPU done by the driver.
Has anyone else observed known good kernels producing bad output after upgrading from an older driver (e.g. CUDA 7.0) to the driver shipping with the CUDA 7.5 release?
I downgraded the CUDA driver to the one included in the CUDA 7.0 toolkit and all is fine again.