(In reply to comment #6)
> Do newer kernels work without radeon driver options on the kernel command
> line, in particular without radeon.msi=0?
> 
> If not, can you bisect which kernel change introduced the problem?

The kernel command line options do not effect the later kernels.

I will need some spare time to bisect, although this bug report looks to be
relevant,
--
 https://bugzilla.redhat.com/show_bug.cgi?id=845745
--
user 'Richard Gration' is running the exact same laptop setup as here and
experiencing identical issues.