I have a Ubuntu 16.04 install just for beta testing the new AMDGPU-Pro 16.20.3 drivers with my R9 285. My machine runs a triple-boot setup with Ubuntu 14.04.4 for fglrx comparisons, and Debian testing for AMDGPU/Mesa comparisons.
In each environment I have Steam installed in a firejail container environment, because I have hundreds of games installed through Steam and don't want untrusted code getting access to other parts of my system. Firejail works very well for this purpose in Debian with Mesa and Ubuntu 14.0.4 with fglrx. It also works well with Steam in Ubuntu 16.04... until the AMDGPU-Pro stack is installed. When AMDGPU-Pro is running, Steam starts segfaulting on launch, and I can see the following from dmesg -T:
[Mon Jun 13 17:24:38 2016] show_signal_msg: 27 callbacks suppressed
[Mon Jun 13 17:24:38 2016] steam: segfault at 0 ip 00000000f660e59b sp 00000000ffa6613c error 4 in amdgpu_dri.so[f442c000+254e000]
If I don't use firejail, Steam works fine with the AMDGPU-Pro stack, which is to be expected since Ubuntu 16.04 is supposed to be supported.
Note that I am using the firejail package that comes from the Ubuntu repositories:
$ apt-cache policy firejail firejail: Installed: 0.9.38-1 Candidate: 0.9.38-1 Version table: *** 0.9.38-1 500 500 http://archive.ubuntu.com/ubuntu xenial/universe amd64 Packages 100 /var/lib/dpkg/status $
Also, my understanding is that the AMDGPU-Pro drivers are supposed to be ready for the Radeon RX 480 launch. Is that still on schedule? I know that Techland (for example) refuses to support AMD drivers while they are still in beta, so Dying Light runs horribly slow (basically unplayable) due to being unoptimized. Also, will Crossfire be supported on GNU/Linux when the 480 launches, or is that still ages away? I'm guessing two 480s in Crossfire would beat a GTX 1080 for some use cases, but that's pointless to consider if AMD can't or won't provide an ETA.
Also, any word on FreeSync support? I brought a FreeSync-capable monitor well over a year ago, and am still waiting to be able to use that technology. Had no idea it would take this long to be supported. Thanks.