[Bug 100572] [SKL dmc] Headless mode media transcoding is 20-30% slower comparing to connected monitor use case

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100572

--- Comment #15 from Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com> ---
More datapoints but no idea if they will provide any clues..

I tried compiling out fbcon and it does change things:

  1. DMC loaded, idle system, no display, fbcon: PKG is in PC2
  2. DMC loaded, idle system, no display, no fbcon: PKG is in PC7

Continuing with no fbcon and trying the HDMI force on - this now does not
restore the performance to normal.

And the i915_dmc_info "DC3 -> DC5" counter is still increasing rapidly as in
the case with DMC, fbcon and no displays.

Without DMC and no fbcon performance is good. (PKG PC7)

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