<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - eDP panel exhibits sparse random noise and flickering (link issue), forcing DP DDI profile helps [Lenovo T450s]" href="https://bugs.freedesktop.org/show_bug.cgi?id=94087#c6">Comment # 6</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - eDP panel exhibits sparse random noise and flickering (link issue), forcing DP DDI profile helps [Lenovo T450s]" href="https://bugs.freedesktop.org/show_bug.cgi?id=94087">bug 94087</a> from <a class="email" href="mailto:alex@alexanderweb.de" title="Alexander Schremmer <alex@alexanderweb.de>"> Alexander Schremmer</a> <pre><a href="https://01.org/sites/default/files/documentation/intel-gfx-prm-osrc-bdw-vol11-display_0.pdf">https://01.org/sites/default/files/documentation/intel-gfx-prm-osrc-bdw-vol11-display_0.pdf</a> says that the eDP table should ONLY be used for low_vswing. I.e. it is always wrong to have the new voltage levels on the eDP links if the VBT did not allow low vswings. I do not see how the current code would differentiate between low and normal vswings. Hmm, but: intel_bios_reader does not have a notion of low vswing (yet). This confused me. By looking at the block 27, its obvious that the huge amount of zeros means that low_vswing is enforced. This in turn means that i915 would be doing the right thing according to the VBT: set low vswing.</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 assignee for the bug.</li> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>