Pekka Helenius

Thanks for quick reply! I have a laptop with Intel HD 4000 + Nvidia GTX 760M, with latest mesa/Nvidia/intel drivers installed. I have the issue with an external monitor connected...

Thanks for the hint! I'll give it a shot. Unfortunately, I don't have time for setting up the testing environment right now but I'll do that in the following weekend....

You're welcome. Take your time, first things first. Still not sure who should do the job, I may take a look as well!

@mmha Haha, welcome to the Arch + Optimus club! :) Thanks for digging more into this and sharing valuable information! If not a perfect solution, one step forward, at least....

Yes I've compiled from the GIT source. Couldn't reproduce the issue with Valgrind (`valgrind --tool=memcheck photoflow`). However, the program still crashes with regular run. With valgrind, hot pixels could successfully...

Here is `valgrind --tool=memcheck photoflow` output log (sorry about missing extension): [Valgrind photoflow log - DropBox](https://www.dropbox.com/s/5jek8964xhvwezd/photoflow-check?dl=1)