Steps to reproduce:
1. Open the attached project
2. Open SampleScene
3. Make sure the projects rendering settings are set to Linear and DX11
4. Press play, a new texture will be created in the Assets folder
5. Exit play mode, Switch to DX12
6. Press play and another texture will be created in the Assets folder

Expected/Actual results: Both textures should be the same. They aren't.

Reproducible with: 2018.1.0a2, 2018.1.2f1, 2018.2.0b7
Not reproducible with: 2017.4.5f1, 2018.1.0a1

Note: When the project is set to Linear color space, doing a ReadPixels and saving the resulting picture gives different results between DX11 and DX12. In DX12 it looks like there's a double Linear -> sRGB conversion taking place at some point.