[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 #30 from Imre Deak <imre.deak at intel.com> ---
(In reply to Sunil Kamath from comment #29)
> quick query:
> when we do not have any display connected, isn't it expected that display
> goes to lowest possible power state? that's DC6?

If all the conditions allow this to happen. That is DC6 is allowed in
DC_STATE_EN, PW2 is disabled (and all display outputs are disabled). Note that
DMC will signal an actual DC6 transition (via its DC6 transition debug counter)
only if other peripherals on the system also allow this. That is you need to do
powertop --auto-tune, and make sure no other devices would block deeper PC
states (it's PC9+ on SKL AFAIR). Examples for these are SSD without ALPM
enabled, active network link, USB device.

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