<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - Linux 4.5 regression: FIFO underruns on Skylake" href="https://bugs.freedesktop.org/show_bug.cgi?id=94337#c12">Comment # 12</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - Linux 4.5 regression: FIFO underruns on Skylake" href="https://bugs.freedesktop.org/show_bug.cgi?id=94337">bug 94337</a> from <a class="email" href="mailto:michael.vorburger+bugs.freedesktop.org@gmail.com" title="Michael Vorburger <michael.vorburger+bugs.freedesktop.org@gmail.com>"> Michael Vorburger</a> <pre>FYI I think this is somehow related to <a class="bz_bug_link bz_status_REOPENED " title="REOPENED - [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe A" href="show_bug.cgi?id=91883">bug 91883</a>, I regularly hit this since weeks, and always see the error from this bug here and the one from that bug appear together, and 1 of 2 externally connected screens "flicker", on a Skylake-based Lenovo T460s under Fedora 24 with the latest updates, today that's a 4.8.4-200.fc24.x86_64 (same as Andre Fredette; we're both @ Red Hat; the T460s is our standard widely rolled out model...) [60954.177636] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun [60961.293531] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe C FIFO underrun [61713.069574] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe B (start=50476 end=50477) time 152 us, min 1073, max 1079, scanline start 1072, end 1083 [62135.779839] CPU2: Core temperature above threshold, cpu clock throttled (total events = 409148) [62135.779859] CPU2: Package temperature above threshold, cpu clock throttled (total events = 547662) [62135.779868] mce_notify_irq: 1 callbacks suppressed [62135.779869] mce: [Hardware Error]: Machine check events logged [62135.782856] CPU2: Core temperature/speed normal [64171.939147] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe B (start=198008 end=198009) time 160 us, min 1073, max 1079, scanline start 1070, end 1081 [64615.439710] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe B (start=224618 end=224619) time 158 us, min 1073, max 1079, scanline start 1072, end 1083 [65694.324329] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe B (start=289351 end=289352) time 178 us, min 1073, max 1079, scanline start 1068, end 1080 [66737.025209] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> <li>You are on the CC list for the bug.</li> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>