https://bugs.freedesktop.org/show_bug.cgi?id=105880
--- Comment #11 from Chí-Thanh Christopher Nguyễn chithanh@gentoo.org --- Created attachment 138824 --> https://bugs.freedesktop.org/attachment.cgi?id=138824&action=edit dmesg from kernel 4.15 with cik_support=1 dc=1 dc_log=1
Going back to kernel 4.15 makes no difference for me. I think that the issue reported in comment 8 is different and should be reported in a separate bug.
Though I noticed that in 4.15, dc_log=1 gives more output than in 4.16 where it doesn't make any difference.