<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - [GLK] Fifo underrun when changing resolution" href="https://bugs.freedesktop.org/show_bug.cgi?id=100302#c4">Comment # 4</a> on <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - [GLK] Fifo underrun when changing resolution" href="https://bugs.freedesktop.org/show_bug.cgi?id=100302">bug 100302</a> from <a class="email" href="mailto:conselvan2@gmail.com" title="Ander Conselvan de Oliveira <conselvan2@gmail.com>"> Ander Conselvan de Oliveira</a> <pre>I still haven't found the root cause for this, but I was enable to narrow it down further: - The underrun only happens with eDP because it is triggered by using the pipe scaler. If I force HDMI to use panel fitting, the underrun is also triggered. - The underrun happens only the first time the scaler is used. After reverting to the panel native resolution, a subsequent modeset won't trigger the underrun again. However, the underrun can be triggered once after a suspend/resume cycle. - Using the scaler to scale a plane before the modeset that triggers the scaler usage by the pipe will also prevent the underrun.</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>