I am using Ubuntu Mate on a recently acquired T420. The Mate optimus software installed great, thanks for that. I did notice that when using the on demand mode that a few things like for example the Ubuntu mate welcome screen, or the boutique wouldn't render. is that a known issue? I did want to mention I am using the recommended 390 NVIDIA drivers, could that also be a problem? And I noticed in the NVIDIA mode the font dpi is off and the text is extremely small until I open the font dpi selection then it goes back to normal. I also don't know if that's a known issue, and if its not who do I let know about this?