How can i enable 2nd AMD GPU driver?

[mkhamat]

I am on Ubuntu 16.04, using 11 version of steam-login (or steam-session) and all runs smooth, but

I have intel+AMD graphics and i looked on steam-de config and there's no dri_prime=1. I'd edit it by myself, but i have no enough experience.

In general, i just need run steam games through your steam-login using my main AMD driver. No matter in what way. I think you'll know better than me and you'll help me.

Thank you for that useful tool, bro.

UPD And DRI_PRIME=1 %command% in steam game launch options are not working in steam-login.