https://bugs.freedesktop.org/show_bug.cgi?id=111987

--- Comment #7 from Witold Baryluk <witold.baryluk+freedesktop@gmail.com> ---
I just also reproduced it using Firefox with WebGL and ShaderToy with custom
reasonably complex shader to load the GPU. With frame rate capped to 60 fps, so
that required reasonably complex shader to load it high. I.e. 17 fps at lows,
and 27 fps at highs. The fps patterns is again periodic and repeating, despite
the shader not depending on time (constantly output a full screen quad with
same pixel content and execution).

GPU temperature is constant 28 deg C even at full blast.

VDD changes from 1.25 to 1.14, 1.10, 1.05, 0.94, 0.90, and sometimes even to
0.85 V. After a while it jumps back to 1.25V and cycle repeats.

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