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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#c22">Comment # 22</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:sunil.kamath@intel.com" title="Sunil Kamath <sunil.kamath@intel.com>"> <span class="fn">Sunil Kamath</span></a>
</span></b>
<pre><span class="quote">>> Some details and further tests to be tried are:
>>
>> Though by avoiding DMC fw load, issue is going away issue is not lilted just
>> to DMC fw. (proved by other tests results)</span >
>
<span class="quote">>Which results are you referring to? So far I haven't been able to reproduce the performance regression without the DMC loaded. But yeah, it is possible it >is an driver - firmware interaction of some sorts.</span >
I am referring to results with “i915.disable_power_wells=0”.
>
<span class="quote">>> Real way to address this is to gracefully handle power infra change for a
>> headless system.
>>
>> “i915.disable_power_wells=0” fixes performance issue on DP too?</span >
>
<span class="quote">>It fixes the issue in headless mode and headless mode cannot have DP connected so not sure what you mean by this?</span >
Here im referring to <a href="show_bug.cgi?id=100572#c19">comment #19</a>. If the same scenario is tested with
i915.disable_power_wells=0. But I got further clarity in below comments from
you.
>
<span class="quote">>What Dmitry observed in #19 is that forcing the DP connector on hasn't got the same workaround effect as forcing the HDMI on does. As far as I could see, >there is some difference in the display code paths, where forcing the DP on does not actually turn on the power well(s). Contrary to forcing the HDMI >connector to on which does this. There is also a difference in system behaviour depending on presence or absence of fbcon, but this is just a secondary >effect of modeset happening or not when the connector is forced.</span >
This is the area where I was seeking efforts from Imre – to clarify further on
power infrastructure handling for headless-system.</pre>
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