<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_REOPENED " title="REOPENED - [SKL] Can't detect external monitor via HDMI after 2nd hotplug" href="https://bugs.freedesktop.org/show_bug.cgi?id=93220#c13">Comment # 13</a> on <a class="bz_bug_link bz_status_REOPENED " title="REOPENED - [SKL] Can't detect external monitor via HDMI after 2nd hotplug" href="https://bugs.freedesktop.org/show_bug.cgi?id=93220">bug 93220</a> from <a class="email" href="mailto:jim.bride@linux.intel.com" title="Jim Bride <jim.bride@linux.intel.com>"> Jim Bride</a> <pre>A few things to note from the logs: Dec 16 04:52:26 u-Precision-5510 kernel: [ 1.342758] [drm:intel_csr_ucode_init] Loading i915/skl_dmc_ver1.bin Dec 16 04:52:26 u-Precision-5510 kernel: [ 1.343350] i915 0000:00:02.0: Direct firmware load for i915/skl_dmc_ver1.bin failed with error -2 Dec 16 04:52:26 u-Precision-5510 kernel: [ 1.343401] [drm:csr_load_work_fn [i915]] *ERROR* Failed to load DMC firmware, disabling rpm You'll probably want to look into this and make sure you have the proper DMC firmware available on the system. Dec 16 04:52:26 u-Precision-5510 kernel: [ 18.470051] nvidia: module license 'NVIDIA' taints kernel. Dec 16 04:52:26 u-Precision-5510 kernel: [ 18.470053] Disabling lock debugging due to kernel taint Dec 16 04:52:26 u-Precision-5510 kernel: [ 18.475242] nvidia 0000:01:00.0: enabling device (0006 -> 0007) Dec 16 04:52:26 u-Precision-5510 kernel: [ 18.475410] [drm] Initialized nvidia-drm 0.0.0 20150116 for 0000:01:00.0 on minor 1 Does this platform have an on-board Nvidia GPU? Dec 16 04:52:26 u-Precision-5510 kernel: [ 20.478421] [drm:i915_hotplug_work_func] Connector HDMI-A-1 (pin 5) received hotplug event. Dec 16 04:52:26 u-Precision-5510 kernel: [ 20.478422] [drm:intel_hdmi_detect] [CONNECTOR:44:HDMI-A-1] We're definitely at least seeing some hot plug activity on the proper HDMI port. Dec 16 04:52:35 u-Precision-5510 kernel: [ 28.865318] [drm:intel_disable_pipe] disabling pipe B Dec 16 04:52:35 u-Precision-5510 kernel: [ 28.867350] [drm:intel_disable_shared_dpll] disable DPLL 1 (active 1, on? 1) for crtc 25 Dec 16 04:52:35 u-Precision-5510 kernel: [ 28.867357] [drm:intel_disable_shared_dpll] disabling DPLL 1 ...and yet here we are tearing down the pipe that was associated with our HDMI connector. Eventually we seem to be able to detect the HDMI monitor again, but we have a few other attempts beforehand. I suspect this (the few failures) is innocuous, but I'm not super familiar with the HDMI code path so I will look into it. I have a few questions: * Has this issue been reproduced more than one time? Is there a deterministic recipe to reproduce the issue? * If the issue is reproducible readily, can you reproduce the issue if the Nvidia module is *not* loaded? I think it's notable that things seemed to go south for us shortly after the Nvidia module was loaded. * If readily reproducible, can it be reproduced with different monitors?</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> </ul> </body> </html>