[Bug 109246] HDMI connected monitors fail to sleep and instead turn back on when amdgpu.dc=1

https://bugs.freedesktop.org/show_bug.cgi?id=109246

--- Comment #18 from krutoileshii@gmail.com --- The function that sets the delay (dc_link_enable_hpd_filter), doesn't seem to be called anywhere as far as I can see. But I'm a complete noob here so might be missing something. (In reply to krutoileshii from comment #17)

I think this could be related to this commit b0c4e977522c34e20ad54ff4ca104129a7cfdeca which removed the delay.: Below patchset seems to be the likely cause as it touches the HDMI portion.

https://lists.freedesktop.org/archives/amd-gfx/2018-February/018956.html