<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW --- - [hsw dp audio] Muting S/PDIF turns off DP" href="https://bugs.freedesktop.org/show_bug.cgi?id=75729#c3">Comment # 3</a> on <a class="bz_bug_link bz_status_NEW " title="NEW --- - [hsw dp audio] Muting S/PDIF turns off DP" href="https://bugs.freedesktop.org/show_bug.cgi?id=75729">bug 75729</a> from <a class="email" href="mailto:mengdong.lin@intel.com" title="Mengdong Lin <mengdong.lin@intel.com>"> Mengdong Lin</a> <pre>Hi Martin/Jani, Sorry for the late reply. I don't think this is an audio driver issue, because audio driver operations does not directly cause screen on/off. Screen on/off is controlled by Gfx driver. For Haswell, the display audio devices (controller + codec) share the same power well with display. So the audio verb excution, such as muting/unmuting S/PDIF can wake up the audio devices and the audio driver will request power from Graphic driver. When audio devcies are idle (in D3), the audio driver will notify gfx driver it does not need the power. That's all. And even if the gfx driver keeps the power well always on, it can still turn on/off the screen. It seems to me that some user space module binds ALSA S/PDIF mute control with screen on/off. Thanks Mengdong</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> </ul> </body> </html>