Created attachment 136779 [details]
dmesg with error

R9 285 Tonga, I see in agd5f 4.17-wip there are commits to do with DVI dual
link. 

I was hoping "Don't block dual-link DVI modes" would enable 120Hz my monitor
supports, which has always worked with without dc.

There is an error in dmesg - don't know if it's related. dmesg and xrandr
attached.

[drm:dal_bios_parser_init_cmd_tbl [amdgpu]] *ERROR* Don't have set_dce_clock
for v0