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Cycles baking time estimate and progress bar doesn't work / progress when baking with high samples.
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Description

System Information
Linux Mint 18.1 Serena
Nvidia GTX 1080 Standard Clock
i7 6700K Standard Clock
16GB Ram

Blender Version
Broken: (2.78b Linux Mint 18.1)
Worked: (2.78b Windows 10)
Worked: (2.78 no a or b - just the initial Release - http://download.blender.org/release/Blender2.78/blender-2.78-linux-glibc219-x86_64.tar.bz2 -, Linux Mint 18.1)

Short description of error


When baking a texture in Cycles with a high amount of samples or large texture-resolution the time left estimate is a huge negative number and the progress-bar doesn't move

Exact steps for others to reproduce the error


Open the attached .blend file, select the Plane object and click "Bake". Check the estimated time left by hovering over the progress bar. Also notice how the progress-bar is not progressing. Happens on both CPU and GPU.