(In reply to Vedran Miletić from comment #13)
> David, can you try newer kernel? I get the same errors with Fedora kernel
> 4.5.4 on
> 
> 01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
> [AMD/ATI] Tonga XT / Amethyst XT [Radeon R9 380X / R9 M295X] [1002:6938]
> (rev f1)
> 
> but the errors are non-fatal, i.e. there is graphics corruption but no
> hangs. Restarting X removes graphics corruption.

Sorry, Vendran, but I ended up buying another laptop (this time from a company
that specializes in Linux laptops), so I no longer have a testbed for this.