<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [WHL] FIFO underruns on a hybrid machine but only while on "performance" (dGPU) mode" href="https://bugs.freedesktop.org/show_bug.cgi?id=109248#c7">Comment # 7</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [WHL] FIFO underruns on a hybrid machine but only while on "performance" (dGPU) mode" href="https://bugs.freedesktop.org/show_bug.cgi?id=109248">bug 109248</a> from <a class="email" href="mailto:cooper.chiou@intel.com" title="Cooper Chiou <cooper.chiou@intel.com>"> Cooper Chiou</a> <pre>Canonical has identified this i915 patch which can't reproduce issue on kernel 4.20 by watermark/ddb fix but it's difficult to apply to kernel 4.15 since lots of commit dependence and conflicts. commit ff43bc379e16c9195323cb88ac0c9f4d0613d07a (refs/bisect/bad) Author: Ville Syrjälä <<a href="mailto:ville.syrjala@linux.intel.com">ville.syrjala@linux.intel.com</a>> Date: Tue Nov 27 18:59:00 2018 +0200 drm/i915: Move ddb/wm programming into plane update/disable hooks on skl+ On SKL+ the plane WM/BUF_CFG registers are a proper part of each plane's register set. That means accessing them will cancel any pending plane update, and we would need a PLANE_SURF register write to arm the wm/ddb change as well.</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>