[Mesa-dev] [Bug 87886] constant fps drops with Intel and Radeon

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87886

--- Comment #29 from Eero Tamminen <eero.t.tamminen at intel.com> ---
You need to do one more test.

if you'll echo max freq value to /sys/kernel/debug/dri/0/i915_min_freq, kernel
will not drop GPU frequency.

If that gets rid of the issue, it's kernel PM issue.

If the CAGF value still goes below max GPU frequency, you got issues outside of
what Linux can control -> the CPU speed gets limited by HW / firmware,
potentially because of temperature issues.

Temperature you can track with lmsensors.  If frequency gets limited when
temperature reaches a certain limit, you need to make sure your CPU is better
cooled.

Updating BIOS may also help, I think newer BIOS versions try to keep
fluctuations smaller (drop freq less, but earlier).

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