<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - [BXT-P /APL] Corruption is seen on eDP with 3 pipes" href="https://bugs.freedesktop.org/show_bug.cgi?id=93917#c4">Comment # 4</a> on <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - [BXT-P /APL] Corruption is seen on eDP with 3 pipes" href="https://bugs.freedesktop.org/show_bug.cgi?id=93917">bug 93917</a> from <a class="email" href="mailto:jim.bride@linux.intel.com" title="Jim Bride <jim.bride@linux.intel.com>"> Jim Bride</a> <pre>(In reply to Jim Bride from <a href="show_bug.cgi?id=93917#c3">comment #3</a>) > [ 2767.011766] [drm:intel_update_cdclk] Current CD clock rate: 288000 kHz > > I wonder if we're running into the following (from the B-Spec SKL+ CDCLK_CTL > register description): > > Do not use DisplayPort with CDCLK less than 432 MHz, audio enabled, port > width x4, and link rate HBR2 (5.4 GHz), or else there may be audio > corruption or screen corruption. Additionally, it's worth noting that on BXT A the only operation external port, Port B (ddi0), has LSPCON in front of it and there is not currently support in the kernel to configure LSPCON. The CDCLK issue is still pertinent perhaps (likely, in fact) but any other behavior on Port B with BXT A is certainly suspect until we have LSPCON configuration support in the kernel.</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>