Hi all, Today I installed boinc, and I'd like to run it with `optirun`. The first time I run `optirun bonic_client --dir /var/lib/boinc`, it showed me that `No usable GPUs found`. So, I installed `opencl-nvidia` package from the repo. After `opencl-nvidia` installed, I restart the boinc with optirun, it showed the same prompt. But after a suspend of my computer, it worked fine! the prompt became like this: ,------ 01-May-2015 11:36:53 [---] CUDA: NVIDIA GPU 0: GeForce GT 620M (driver version unknown, CUDA version 7.0, compute capability 2.1, 1024MB, 1009MB available, 240 GFLOPS peak) 01-May-2015 11:36:53 [---] OpenCL: NVIDIA GPU 0: GeForce GT 620M (driver version 349.16, device version OpenCL 1.1 CUDA, 1024MB, 1009MB available, 240 GFLOPS peak) `------ And a project began to use GPU to caculate as well. However, after I reboot my computer, the boinc can't find GPUs any more! The prompt is always `No usable GPUs found`. I also tried to write a simple CUDA program[1] to test if my CUDA device was ok, and the result was the CUDA program worked fine, it printed 'Hello CUDA!' as expected. My GPU model is NVIDIA GeForce GT 620M as mentioned above. My laptop model is Acer E1-471G 32352G50Mnks. I also have bbswitch installed, and `cat /proc/acpi/bbswitch` shows: ,------ 0000:01:00.0 ON `------ And here is the output of `lsmod |grep nvidia`: ,------ nvidia_uvm 73728 0 nvidia 8409088 1 nvidia_uvm drm 282624 6 i915,drm_kms_helper,nvidia i2c_core 53248 8 drm,i915,i2c_i801,drm_kms_helper,i2c_algo_bit,nvidia,v4l2_common,videodev `------ Anyone knows how I can run boinc with `optirun` correctly, or how I can run boinc with my GPU? Any reply will be appreciated! [1] https://cfp.vim-cn.com/cbSR/c -- Regards, Stephen