I've bisected it to this commit

[root@fx6 linux2]# git bisect bad
df1e63942063a0638a5813e5904988d834db2665 is the first bad commit
commit df1e63942063a0638a5813e5904988d834db2665
Author: Rex Zhu <[email protected]>
Date:   Fri Sep 1 13:46:20 2017 +0800

    drm/amd/powerplay: delete eventmgr layer in poweprlay

    Reviewed-by: Alex Deucher <[email protected]>
    Signed-off-by: Rex Zhu <[email protected]>
    Signed-off-by: Alex Deucher <[email protected]>

:040000 040000 5b955ab18919974b351c81565044f3280253fe03 35f848a30a0b57d7fdee53133ae5d8e066406d8f M drivers

The commit before this has a properly throttling mclk with glmark2/xonotic-glx and this commit does not (locks at 300MHz). Should point that the commit ahead of this locks at 150MHz (lowest setting).

I haven't actually looked at this commit for a fix yet.

Cheers,
Tom
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