[Bug 89113] New: NVA8 constantly flickers when clocked to lowest pstate

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=89113

            Bug ID: 89113
           Summary: NVA8 constantly flickers when clocked to lowest pstate
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
          Reporter: charleszhang77-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
        QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org

Created attachment 113426
  --> https://bugs.freedesktop.org/attachment.cgi?id=113426&action=edit
VBIOS

with stock nouveau from kernel 3.19.0-1.fc22.x86_64

this nva8 came with a thinkpad t410

my pstate file looks like this: 
03: core 135 MHz shader 270 MHz memory 135 MHz
07: core 405 MHz shader 810 MHz memory 405 MHz
0f: core 606 MHz shader 1468 MHz memory 790 MHz
AC: core 405 MHz shader 810 MHz memory 405 MHz

when clocking to 07 or 0f everything works.
however, when clocking to pstate=03 i get constant flickering (maybe <5-10 hz),
although the clocks do change, and nothing crashes. (i can change clocks back
to 07 or 0f with no more flickering)

vbios attached

mmiodump where i fumbled around with powermizer while the blob reclocked
(no second monitor attached):
https://www.dropbox.com/s/jjh6hpcix1swc7r/mmiotrace.log?dl=0

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