Connecting a ramp attribute to the basecolor/emmision color of a material creates darker colors than the result should be on XPU vs CPU.
In the example bellow you can see the huge difference between one and the other one. This is just a ramp applied to an mtlx_unlit surface.
I have seen post that XPU seems to limit the albedo but this should not be it right? as the difference does not exist if I just use the color input of the mtlx_unlit surface node rather than connecting the ramp. PS using latest production build and studio driver.

can you post a repro scene? (or better yet, file a bug)
thanks lots!

brians
can you post a repro scene? (or better yet, file a bug)
thanks lots!

Sorry for the late reply, I was occupied with other tasks, here I've attached a sample Hip.
I've already posted the bug, though I am still not sure if this is a bug or some energy conservation issue with XPU I need to understand.
I will update this post as soon as I know the bug report number.

Thanks,
Nico.