Substance Painter roughness map looks faulty in Maya viewport 2.0 and Arnold RenderView.

[ferizsolnai]

I export tga files from Substance Painter with the Arnold aiStandard export preset. In Maya, I set the colour space to RAW for the normal, metalness and roughness maps. Alpha is luminence on. But it does seem the roughness map does not apply, neither in viewport 2.0, nor in Arnold renderview.
My Substance and Maya are up-to-date. I tried looking for answers, but couldn't find anything that would help so I'm kind of desperate now.
Is it something trivial I'm missing?

[lcollod]

Hello,

1. Have you tried to open the texture and see if your texture is existing ?
2. Instead of plugging in the alpha, try to plug the Red channel (expand the Out Color by clicking on the plus) in the roughness

[ferizsolnai]

I don't quite understand your first question.

I tried plugging in the red channel instread of the alpha. It created similar results.