After removing all devices plugged in one by one, Issue seems to be caused by my USB dongle needed for my wireless keyboard and mouse...
I've seen report online see below https://askubuntu.com/questions/884199/grub-freezes-when-logitech-unifying-receiver-plugged-in https://h30434.www3.hp.com/t5/Notebook-Operating-System-and-Recovery/Linux-Spectre-x360-13-late-2019-does-not-work-with-Linux/td-p/7316977 Those two reports seem limited to my hardware, could be HP BIOS. the recommended workaround is to enable Legacy Mode which isn't acceptable for me since it requires to disable Secure Boot. -- 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/1866852 Title: System Display black screen on reboot or after a clean shutdown with USB-C Dock Monitor Status in grub2 package in Ubuntu: New Status in linux package in Ubuntu: Invalid Bug description: I'm running focal devel and the latest kernel (see proc version below) Linux version 5.4.0-18-generic (buildd@lgw01-amd64-034) (gcc version 9.2.1 20200306 (Ubuntu 9.2.1-31ubuntu3)) #22-Ubuntu SMP Sat Mar 7 18:13:06 UTC 2020 Dock Monitor is supported very well with multiple usb devices plugged on the monitor. However on reboot I face a black screen with no ability to enter my FDE password. Both my Laptop screen and the attached usb-c display nothing I have to hard power off and reboot without the USB-C monitor plugged in. Otherwise A reboot cycle with the usb-c unplugged works perfectly. Also I tried to run ubuntu-bug linux or ubuntu-bug linux-image-generic without success. I would be happy to provide much more debugging information. I will attach then to the launchpad Bug # --- ProblemType: Bug ApportVersion: 2.20.11-0ubuntu18 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC2: mclemenceau 2988 F.... pulseaudio /dev/snd/controlC0: mclemenceau 2988 F.... pulseaudio /dev/snd/controlC1: mclemenceau 2988 F.... pulseaudio CurrentDesktop: ubuntu:GNOME DistroRelease: Ubuntu 20.04 InstallationDate: Installed on 2020-01-05 (64 days ago) InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017) MachineType: HP HP Spectre x360 Convertible 13-ae0xx NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair Package: linux (not installed) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-18-generic root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 5.4.0-18.22-generic 5.4.24 RelatedPackageVersions: linux-restricted-modules-5.4.0-18-generic N/A linux-backports-modules-5.4.0-18-generic N/A linux-firmware 1.186 Tags: focal Uname: Linux 5.4.0-18-generic x86_64 UpgradeStatus: Upgraded to focal on 2020-01-23 (47 days ago) UserGroups: adm cdrom dip libvirt lpadmin lxd plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 06/14/2018 dmi.bios.vendor: AMI dmi.bios.version: F.21 dmi.board.asset.tag: Base Board Asset Tag dmi.board.name: 83B9 dmi.board.vendor: HP dmi.board.version: 56.41 dmi.chassis.type: 31 dmi.chassis.vendor: HP dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnAMI:bvrF.21:bd06/14/2018:svnHP:pnHPSpectrex360Convertible13-ae0xx:pvr:rvnHP:rn83B9:rvr56.41:cvnHP:ct31:cvrChassisVersion: dmi.product.family: 103C_5335KV HP Spectre dmi.product.name: HP Spectre x360 Convertible 13-ae0xx dmi.product.sku: 2TV18AS#ABA dmi.sys.vendor: HP To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1866852/+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
