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Ubuntu 16.04 (xenial) reached end-of-standard-support on April 29, 2021. I'm setting the status of this bug to 'Incomplete' as it's not seen any activity for some time. If this is still an issue when using a currently maintained release of Ubuntu then please let us know which one(s) otherwise this bug report can be left to expire in approximately 60 days time. ** Package changed: xorg (Ubuntu) => ubuntu ** Changed in: ubuntu Status: New => Incomplete -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1604742 Title: Black screen when booting without nomodeset Status in Ubuntu: Incomplete Bug description: It happens intermittently. Some times after a kernel upgrade it boots fine, but immediately after the screensaver turns on the screen gets black with the backlight on. After a good boot it returns to booting to a black screen. The system is working while the black screen is on. I am able to log in and shutdown via console (blindly) I have tried to write dmesg to a file while it is in this mode and I got this: [ 1835.947242] cfg80211: (5815000 KHz - 5850000 KHz @ 35000 KHz), (N/A, 3301 mBm), (0 s) [ 1835.947243] cfg80211: (17100000 KHz - 17300000 KHz @ 200000 KHz), (N/A, 2000 mBm), (N/A) [ 1835.947244] cfg80211: (57000000 KHz - 66000000 KHz @ 2160000 KHz), (N/A, 4000 mBm), (N/A) [ 1835.952825] wlp3s0: Limiting TX power to 18 dBm as advertised by 04:da:d2:fd:7d:0e [ 1998.759411] [drm:intel_dp_link_training_clock_recovery [i915_bpo]] *ERROR* too many full retries, give up [ 1998.770230] [drm:intel_dp_link_training_clock_recovery [i915_bpo]] *ERROR* too many full retries, give up [ 1998.781095] [drm:intel_dp_link_training_clock_recovery [i915_bpo]] *ERROR* too many full retries, give up [ 1998.791896] [drm:intel_dp_link_training_clock_recovery [i915_bpo]] *ERROR* too many full retries, give up [ 1998.802880] [drm:intel_dp_link_training_clock_recovery [i915_bpo]] *ERROR* too many full retries, give up [ 1998.813780] [drm:intel_dp_link_training_clock_recovery [i915_bpo]] *ERROR* too many full retries, give up [ 1998.824569] [drm:intel_dp_link_training_clock_recovery [i915_bpo]] *ERROR* too many full retries, give up [ 1998.824747] [drm:intel_dp_start_link_train [i915_bpo]] *ERROR* failed to train DP, aborting This was after a boot failed. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: xorg (not installed) ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13 Uname: Linux 4.4.0-31-generic x86_64 NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia .proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0000:01:00.0' .proc.driver.nvidia.registry: Binary: "" .proc.driver.nvidia.version: NVRM version: NVIDIA UNIX x86_64 Kernel Module 367.35 Mon Jul 11 23:14:21 PDT 2016 GCC version: gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.1) .tmp.unity_support_test.1: ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: compiz CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0' CompositorUnredirectFSW: true CurrentDesktop: Unity Date: Wed Jul 20 11:41:21 2016 DistUpgraded: Fresh install DistroCodename: xenial DistroVariant: ubuntu DkmsStatus: bbswitch, 0.8, 4.4.0-28-generic, x86_64: installed bbswitch, 0.8, 4.4.0-31-generic, x86_64: installed nvidia-367, 367.35, 4.4.0-31-generic, x86_64: installed ExtraDebuggingInterest: Yes GraphicsCard: Intel Corporation Skylake Integrated Graphics [8086:191b] (rev 06) (prog-if 00 [VGA controller]) Subsystem: CLEVO/KAPOK Computer Skylake Integrated Graphics [1558:1501] NVIDIA Corporation Device [10de:1667] (rev a1) (prog-if 00 [VGA controller]) Subsystem: CLEVO/KAPOK Computer Device [1558:1503] InstallationDate: Installed on 2016-07-09 (10 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 004: ID 1c7a:0603 LighTuning Technology Inc. Bus 001 Device 003: ID 5986:066d Acer, Inc Bus 001 Device 002: ID 0cf3:e300 Atheros Communications, Inc. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: Notebook N15_N17RF1 ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-31-generic.efi.signed root=UUID=32802ab4-59f5-434e-a6a4-8ee988bf7e24 ro nomodeset quiet splash vt.handoff=7 Renderer: Software SourcePackage: xorg UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/01/2016 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 1.05.02 dmi.board.asset.tag: Tag 12345 dmi.board.name: N15_N17RF1 dmi.board.vendor: Notebook dmi.board.version: Not Applicable dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: Notebook dmi.chassis.version: N/A dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.05.02:bd04/01/2016:svnNotebook:pnN15_N17RF1:pvrNotApplicable:rvnNotebook:rnN15_N17RF1:rvrNotApplicable:cvnNotebook:ct10:cvrN/A: dmi.product.name: N15_N17RF1 dmi.product.version: Not Applicable dmi.sys.vendor: Notebook version.compiz: compiz 1:0.9.12.2+16.04.20160714-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.67-1ubuntu0.16.04.1 version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2 version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2.2 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160325-1ubuntu1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2 xserver.bootTime: Wed Jul 20 11:23:21 2016 xserver.configfile: default xserver.logfile: /var/log/Xorg.0.log xserver.outputs: xserver.version: 2:1.18.3-1ubuntu2.2 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1604742/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp