drm-next-kmod and 11.2-RELEASE

restart never show anythink
I am not sure about UEFI. You must first ensure of system console with boot screen & find error there. Then start(x) X server with vesa/scfb drivers. The ati legacy driver is new & not properly tested. You probably have used "radeon" driver earlier with dri2. Some time "drm" drivers have it's own issues also.Link/
 
What I gather, it is intended for post intel HD3000 & ati HD 6800 series.
Some users say it works for some older one without UFEI. Again there were some problems for xf86-video-ati. Still there are some issues for drm. I have browser & video player crashed some time in stable with drm-next-kmod.
 
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