Created attachment 131698 [details] ERROR INFO System Info : laptop: Dell E5270 cpu: Intel(R) Core(TM) i5-6200U Graphic: Intel HD520 Kernel: 4.4.35-1 libdrm: 2.4.75 Error info: When connect a Display to the laptop VGA Display port,system hangup and print [drm: intel_dp_link_trainning_clock_recovery [i915] *ERROR* too many full retries.give up ........ ........ ........
Hello Wanglei, is system hangup occasional or 100% reproducible? Your kernel version is quite old. Please try to reproduce the failure with the latest kernel (canonical/kernel.org longterm 4.4.70 or preferable with drm-tip or stable 4.11.3) and provide the logs from that as instructed in https://01.org/linuxgraphics/documentation/how-report-bugs. It might also help if you can attach i915_display_info file from /sys/kernel/debug/dri/0 (if you can generate image from drm-tip with debugfs enabled).
I tried to reproduce this bug but I could not reproduce with the following configuration: ====================================== Graphic stack ====================================== ====================================== Software ====================================== kernel version : 4.12.0-rc3-drm-tip-ww22-commit-187376e+ architecture : x86_64 os version : Ubuntu 17.04 os codename : zesty kernel driver : i915 bios revision : 4.6 bios release date : 03/02/2017 ====================================== Graphic drivers ====================================== mesa : 17.0.3 modesetting : modesetting_drv.so xorg-xserver : 1.19.3 libdrm : 2.4.81 cairo : 1.14.8 xserver : X.Org X Server 1.19.99.1 intel-gpu-tools (tag) : intel-gpu-tools-1.18-211-g00ce341b intel-gpu-tools (commit) : 00ce341b ====================================== Hardware ====================================== platform : HSW-Nuc motherboard id : D54250WYK form factor : Desktop cpu family : Core i5 cpu family id : 6 cpu information : Intel(R) Core(TM) i5-4250U CPU @ 1.30GHz gpu card : Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 09) (prog-if 00 [VGA controller]) memory ram : 3.79 GB max memory ram : 16 GB display resolution : 1600x900 cpu thread : 4 cpu core : 2 cpu model : 69 cpu stepping : 1 socket : Socket LGA1150 signature : Type 0, Family 6, Model 69, Stepping 1 hard drive : 223GiB (240GB) current cd clock frequency : 450000 kHz maximum cd clock frequency : 450000 kHz displays connected : DP-1 ====================================== Firmware ====================================== ====================================== kernel parameters ====================================== quiet splash fastboot drm.debug=0xe
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