<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [SNB/IVB/BYT-M/HSW]igt/kms_flip some some cases hang and cause system unable to reboot." href="https://bugs.freedesktop.org/show_bug.cgi?id=89033#c3">Comment # 3</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [SNB/IVB/BYT-M/HSW]igt/kms_flip some some cases hang and cause system unable to reboot." href="https://bugs.freedesktop.org/show_bug.cgi?id=89033">bug 89033</a> from <a class="email" href="mailto:hengx.ding@intel.com" title="Ding Heng <hengx.ding@intel.com>"> Ding Heng</a> <pre>Add HSW in this bug. After running several sub cases in kms_flip, every kms_flip subcase will cause such dmesg output even it run well before: dmesg -r |grep '<[1-4]>'|grep drm <3>[10539.077274] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A <3>[10539.077283] [drm:cpt_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun <3>[10539.078778] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe A <3>[10539.078788] [drm:ironlake_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun And keep on running kms_flip subcases, you may see the case hang and not able to be stopped and system could not reboot either.</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>