<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <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#c30">Comment # 30</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 <a class="email" href="mailto:imre.deak@intel.com" title="Imre Deak <imre.deak@intel.com>"> Imre Deak</a> <pre>(In reply to Sunil Kamath from <a href="show_bug.cgi?id=100572#c29">comment #29</a>) > 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.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>