<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [BDW] intel_iommu=on GPU hang" href="https://bugs.freedesktop.org/show_bug.cgi?id=100076#c1">Comment # 1</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [BDW] intel_iommu=on GPU hang" href="https://bugs.freedesktop.org/show_bug.cgi?id=100076">bug 100076</a> from <a class="email" href="mailto:yunying.sun@intel.com" title="yunying sun <yunying.sun@intel.com>"> yunying sun</a> <pre>When testing tboot on an Intel NUC5i5MYHE, graphics display nothing but a black screen after system boot up. There's also GPU hang found in kernel log: [ 68.752002] [drm] GPU HANG: ecode 8:0:0x85dffffb, in X [1616], reason: Hang on render ring, action: reset [ 68.752005] [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace. [ 68.752007] [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel [ 68.752008] [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue. [ 68.752008] [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it. [ 68.752009] [drm] GPU crash dump saved to /sys/class/drm/card0/error Such GPU hang is seen with RHEL 7.4 SP1/SLES12 SP3 Beta3/Ubuntu 17.04. Attached RHEL 7.4 kernel log and error log from /sys/class/drm/card0/error. After adding "intel_iommu=on,igfx_off" to boot cmdline, no GPU hang found and display shows desktop normally after system boot up.</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> <li>You are the assignee for the bug.</li> </ul> </body> </html>