<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - System crashes after "[drm] IP block:gmc_v8_0 is hung!" / [drm] IP block:sdma_v3_0 is hung!" href="https://bugs.freedesktop.org/show_bug.cgi?id=102322#c37">Comment # 37</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - System crashes after "[drm] IP block:gmc_v8_0 is hung!" / [drm] IP block:sdma_v3_0 is hung!" href="https://bugs.freedesktop.org/show_bug.cgi?id=102322">bug 102322</a> from <a class="email" href="mailto:jb5sgc1n.nya@20mm.eu" title="dwagner <jb5sgc1n.nya@20mm.eu>"> dwagner</a> <pre>In the related bug report (<a class="bz_bug_link bz_status_NEW " title="NEW - GPU fault detected: 146 / VM_CONTEXT1_PROTECTION_FAULT / ring gfx timeout" href="show_bug.cgi?id=107152">https://bugs.freedesktop.org/show_bug.cgi?id=107152</a>) I noticed that this bug can be triggered very reliably and quickly by playing a video with a deliberately lowered frame rate: "mpv --no-correct-pts --fps=3 --ao=null some_arbitrary_video.webm" This led me to assume this bug might be caused by the dynamic power management, that often ramps performance up/down when a video is played at such a low frame rate. And indeed, I found this confirmed by many experiments: If I use a script like > #!/bin/bash > cd /sys/class/drm/card0/device > echo manual >power_dpm_force_performance_level > # low > echo 0 >pp_dpm_mclk > echo 0 >pp_dpm_sclk > # medium > #echo 1 >pp_dpm_mclk > #echo 1 >pp_dpm_sclk > # high > #echo 1 >pp_dpm_mclk > #echo 6 >pp_dpm_sclk to enforce just any performance level, then the crashes do not occur anymore - also with the "low frame rate video test". So it seems that the transition from one "dpm" performance level to another, with a certain probability, causes these crashes. And the more often the transitions occur, the sooner one will experience them. (BTW: For unknown reason, invoking "xrandr" or enabling a monitor after sleep causes the above settings to get lost, so one has to invoke above script again.)</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>