Did you install Steam from the Software Center in Solus or did you install it via the Steam website? You have to install Steam via the Solus Software Center as Solus has performed some very handy modifications with Stem integration. It does wirk, I have a machine running it here. The only time I had issues installing Steam was under AMD open source drivers as the installation of Steam caused a dependancy issue - A quick Google and all was fixed in no time. Its not like I havent had issues with Steam under other OS's and I have other Ubuntu machines here running Steam no worries as downloaded off the Steam site itself. If you're going AMD the open source drivers combined with Mesa as installed by default are the best performance wise and come installed out of the box. Getting the AMDGPU drivers installed can be problematic and aren't as good performance wise - The freesync monitor will give you grief under the open source drivers and it's unlikely freesync will work.