<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - Delay in skl_disable_plane() causes a system freeze" href="https://bugs.freedesktop.org/show_bug.cgi?id=104975#c36">Comment # 36</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - Delay in skl_disable_plane() causes a system freeze" href="https://bugs.freedesktop.org/show_bug.cgi?id=104975">bug 104975</a> from <a class="email" href="mailto:azhar.shaikh@intel.com" title="Azhar <azhar.shaikh@intel.com>"> Azhar</a> <pre>After enabling the CONFIG_DRM_I915_DEBUG_VBLANK_EVADE on chromeos-4.14 kernel, was able to see the warning messages and the issue/system hang. Please check the attached logs. On Marteen's 4.15 linux stable branch, with just couple of prints in skl_disable_plane() was able to reproduce the issue/system hang. [ 57.951813] [drm:skl_disable_plane] *ERROR* Disabling plane @ 321 : plane 2A [ 57.959722] [drm:drm_atomic_helper_commit_planes_on_crtc] *ERROR* Disabling plane @ 326 : plane 2A POST READ [ 57.970733] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A FIFO underrun [ 65.269469] [drm:skl_disable_plane] *ERROR* Disabling plane @ 321 : plane 2A [ 65.277357] [drm:drm_atomic_helper_commit_planes_on_crtc] *ERROR* Disabling plane @ 326 : plane 2A POST READ [ 69.290422] [drm:skl_disable_plane] *ERROR* Disabling plane @ 321 : plane 2A [ 69.298349] [drm:drm_atomic_helper_commit_planes_on_crtc] *ERROR* Disabling plane @ 326 : plane 2A POST READ [ 70.558620] [drm:skl_disable_plane] *ERROR* Disabling plane @ 321 : plane 2A [ 70.566506] [drm:drm_atomic_helper_commit_planes_on_crtc] *ERROR* Disabling plane @ 326 : plane 2A POST READ Without the prints on Marteen's linux stable branch I do not see the issue/system hang.</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>