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I have 2 systems with AMD/ATI graphics that hang trying to start the Xserver after a graphical login. I also have 1 system with AMD.ATI graphics cards that seems to work just fine. I will post the output from lshw on all three systems.
Created attachment 1142384 [details] lshw output from HP Probook 4545s - exhibits failure
Created attachment 1142385 [details] lshw output from ASUS X550E - exhibits failure
Created attachment 1142386 [details] lshw output from Samsung NP305E5A-A05US - works fine
Reverting to kernel version 4.4.6-300.fc23.x86_64 avoids the issue.
Obviously, I could have just as easily filed this under the xorg ATI driver. Feel free to change the component if you determine that is the right thing to do.
IT appears this has nothing to do with the xorg ati driver as that does not even seem to come into play anymore.
The issue is identical if I completely uninstall the xorg-x11-drv-ati package. Everything still works with the 4.4.6 kernel and fails with the current fedora 24 kernel.
Hmm seems I was wrong there. it looked just as hung, and although the behavior is still bad without the xorg ati driver and it seems to take forever fr anything to happen it is really not the same hang. But still no problems with or without this driver installed with the older kernel so I have no idea what that means.
Not sure what fixed it, but current fedora24 builds work correctly on both of the laptops which previously exhibited this issue.
Glad to hear it, there were a few fixes in the recent stable updates that likely took care of it.