The problem first appeared in kernel 4.8.0. It is worth noting that the boot delays are not particularly excessive with this kernel version, but increase with each subsequent version to the point of several minutes delay using 4.15.0.20.23 (18.04LTS default kernel).
** Attachment added: "dmesg from mainline kernel 4.8.0" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1769421/+attachment/5136565/+files/dmesg-4.8.0-040800-generic.txt -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1769421 Title: [18.04] [Bionic]drm_kms_helper causes long delay at boot Status in linux package in Ubuntu: Confirmed Bug description: System upgraded from 16.04 to 18.04 experiences long delays at boot -- generally 4-5 minutes. The same system experienced no significant delays prior to the upgrade. dmesg reports problems with drm_kms_helper. Description: Ubuntu 18.04 LTS Release: 18.04 linux-generic: Installed: 4.15.0.20.23 Candidate: 4.15.0.20.23 Version table: *** 4.15.0.20.23 500 500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages 100 /var/lib/dpkg/status Expected to happen: System boots in reasonable amount of time, consistent with prior LTS release. What happened: System is very slow to boot, on the order of several minutes to reach a login screen. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: linux-image-generic 4.15.0.20.23 ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17 Uname: Linux 4.15.0-20-generic x86_64 ApportVersion: 2.20.9-0ubuntu7 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: gdm 1012 F.... pulseaudio scott 2346 F.... pulseaudio Date: Sat May 5 23:19:14 2018 HibernationDevice: RESUME=UUID=a816bb7e-ab3e-49ea-9bbe-0f1d0e016b0e InstallationDate: Installed on 2017-09-05 (242 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) MachineType: LENOVO 0769AK8 ProcEnviron: TERM=xterm-256color PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-20-generic root=UUID=a3217eb0-fa66-4420-9eb3-5f3a38cb1af0 ro splash vt.handoff=1 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-4.15.0-20-generic N/A linux-backports-modules-4.15.0-20-generic N/A linux-firmware 1.173 RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 07/29/2008 dmi.bios.vendor: LENOVO dmi.bios.version: 68ET37WW dmi.board.name: IEL10 dmi.board.vendor: LENOVO dmi.board.version: REFERENCE dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: No Enclosure dmi.chassis.version: N/A dmi.modalias: dmi:bvnLENOVO:bvr68ET37WW:bd07/29/2008:svnLENOVO:pn0769AK8:pvr3000N200:rvnLENOVO:rnIEL10:rvrREFERENCE:cvnNoEnclosure:ct10:cvrN/A: dmi.product.family: Lenovo dmi.product.name: 0769AK8 dmi.product.version: 3000 N200 dmi.sys.vendor: LENOVO --- ApportVersion: 2.20.9-0ubuntu7 Architecture: amd64 DistroRelease: Ubuntu 18.04 InstallationDate: Installed on 2017-09-05 (245 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) Package: linux (not installed) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash Tags: bionic Uname: Linux 4.17.0-041700rc4-generic x86_64 UnreportableReason: The running kernel is not an Ubuntu kernel UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: _MarkForUpload: True --- ApportVersion: 2.20.9-0ubuntu7 Architecture: amd64 DistroRelease: Ubuntu 18.04 InstallationDate: Installed on 2017-09-05 (245 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) Package: linux (not installed) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash Tags: bionic Uname: Linux 4.8.0-040800-generic x86_64 UnreportableReason: The running kernel is not an Ubuntu kernel UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: _MarkForUpload: True --- ApportVersion: 2.20.9-0ubuntu7 Architecture: amd64 DistroRelease: Ubuntu 18.04 InstallationDate: Installed on 2017-09-05 (245 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) Package: linux (not installed) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash Tags: bionic Uname: Linux 4.7.10-040710-generic x86_64 UnreportableReason: The running kernel is not an Ubuntu kernel UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: _MarkForUpload: True To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1769421/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
