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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL dmc] Headless mode media transcoding is 20-30% slower comparing to connected monitor use case"
href="https://bugs.freedesktop.org/show_bug.cgi?id=100572#c26">Comment # 26</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL dmc] Headless mode media transcoding is 20-30% slower comparing to connected monitor use case"
href="https://bugs.freedesktop.org/show_bug.cgi?id=100572">bug 100572</a>
from <span class="vcard"><a class="email" href="mailto:imre.deak@intel.com" title="Imre Deak <imre.deak@intel.com>"> <span class="fn">Imre Deak</span></a>
</span></b>
<pre>(In reply to Tvrtko Ursulin from <a href="show_bug.cgi?id=100572#c25">comment #25</a>)
<span class="quote">> One of the experiments Animesh asked me to do was to look at the state of
> the DC_STATE_EN register at runtime.
>
> It looked that it had reverted to a value other than what was programmed by
> i915. On top of that, it looked impossible to manually modify it at runtime.
>
> The value it is reverting to was DC_STATE_EN_UPTO_DC6, regardless of whether
> the driver has programmed DC_STATE_EN_UPTO_DC5 or DC_STATE_EN_UPTO_DC5 |
> DC_STATE_EN_UPTO_DC6.
>
> This coupled with a comment in gen9_write_dc_state makes me suspicious
> whether DMC is not doing things behind the drivers back?</span >
We don't use DC5 on SKL normally only DC6. Did you boot with i915.enable_dc set
to something non-default?</pre>
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