Running CUDA on ThinkPad w550s Ubuntu system (Quadro K620M) [closed]

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I am using Ubuntu 14.04 and I am new to GPU. I installed CUDA 7.5, the nvidia driver on my computer is

$ nvidia-settings -q NvidiaDriverVersion
Attribute 'NvidiaDriverVersion' (xxx-ThinkPad-W550s:0.0): 340.96
Attribute 'NvidiaDriverVersion' (xxx-ThinkPad-W550s:0[gpu:0]): 340.96

When I go to /usr/local/cuda/samples/1_Utilities/deviceQuery and execute ./deviceQuery it will show me that

CUDA driver version is insufficient for CUDA runtime version

I was trying to update and reinstall the new driver 352 by using sudo apt-get install nvidia-352 nvidia-settings. But when I check the driver version, it is still 340.96.

How can I fix this problem?

Answer

Whenever you upgrade the NVIDIA kernel driver, you must reboot the machine before the new driver can become active. That was the problem in the case.

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