<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - [GLK] no signal after switch resolution from 1080p@23.98" href="https://bugs.freedesktop.org/show_bug.cgi?id=105887#c68">Comment # 68</a> on <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - [GLK] no signal after switch resolution from 1080p@23.98" href="https://bugs.freedesktop.org/show_bug.cgi?id=105887">bug 105887</a> from <a class="email" href="mailto:clinton.a.taylor@intel.com" title="Clinton Taylor <clinton.a.taylor@intel.com>"> Clinton Taylor</a> <pre>After bashing my head against he wall for several days I have finally determined that the issue is caused by the HDMI level shifter on the board and not a driver issue. After changing the mode from 1080p24 to 1080p50 the scope shows a valid clock into the level shifter and a very low amplitude clock on the output to the connector. Adding a short delay after the Transcoder is disabled appears to solve the issue with the level shifter. I have attached a scope shot of the waveform into the level shifter (yellow trace) and the output to the connector (blue trace).</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are on the CC list for the bug.</li> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>