Comment # 26 on bug 1195142 from HJF Boschker

(In reply to Andreas Vetter from comment #10)
> (In reply to Takashi Iwai from comment #5)
> > I guess not, unless there is another urgent security fix coming up.
> > 
> > As a workaround, you can simply copy the old radeon module file from
> > 5.3.18-59.40 to *-43, e.g.
> >   # mkdir /lib/modules/5.3.18-*.43-default/updates
> >   # cp
> > /lib/modules/5.3.18-*.40-default/kernel/drivers/gpu/drm/radeon/radeon.ko*
> > /lib/modules/5.3.18-*.43-default/updates/
> >   # depmod 5.3.18-150300.59.43-default
> >   # mkinitrd
> 
> This workaround works for my 
> [AMD/ATI] Turks PRO [Radeon HD 6570/7570/8550 / R5 23

Also in my case this worked perfect.