Not truth!  I see only 405 MHz of core in newer kernel 4.x in 

/sys/kernel/debug/dri/<number>/pstate. It was first argument for me, that something is not good compared to kernel 3.19.

2018-06-25 16:25 GMT+02:00 <bugzilla-daemon@freedesktop.org>:

Comment # 13 on bug 107016 from Roy

(In reply to atirage21 from comment #12)
> Created attachment 140326 [details]
> attachment-20771-0.html
> 
> But also is question: Why i had only 405 Mhz of core under kernel 4.x,
> if under kernel 3.19 was more options to see (and same more options is
> with propretiary driver):
> 
> [    4.311074] nouveau  [     CLK][0000:01:00.0] 07: core 270-405 MHz
> memory 810 MHz
> [    4.311090] nouveau  [     CLK][0000:01:00.0] 0f: core 270-745 MHz
> memory 1800 MHz
> [    4.311233] nouveau  [     CLK][0000:01:00.0] --: core 405 MHz memory 648
> MHz
> 

That's just reduced verbosity of the driver in newer kernels. There's no need
to report that during boot, just clutters the log. You'll find all those
entries in /sys/kernel/debug/dri/<number>/pstate.

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