Since Alt-SysRq-w gives nothing, I'm sure the long delay is not a kernel/driver issue but a user space issue. It looks due to some reason I just can not reproduce the long delay. :-(
In the Hyper-V Virtual Machine Connection window's "View" menu, there is an item "Enhanced Session". In my Ubuntu 19.10 VM created by "Quick Create...", the xrdp daemon/service is configured to automatically run during the boot-up procedure; I think as soon as the xrdp daemon starts to run, the "Enhanced Session" item becomes clickable/usable, and I can click it to toggle between "Enhanced Session" mode (i.e. xrdp mode) and the native Xorg GUI mode; when I'm in the xrdp mode, I click VM Connection window's Action | Shut Down, then Start, and the VM will boot up to the xrdp login screen in about 14 seconds; when I'm in the Xorg mode, I click Shutdown then Start, the VM will boot up to the Xorg GUI desktop in about 30 seconds. If I shut down the VM, close the VM Connection window, and start the VM and open VM Connection window, I'll be prompted by a small pop-up window to choose a resolution when (I think) the xrdp daemon starts to run: 1) if I click the close icon of the small window, I'll be in the Xorg GUI mode; if I accept the default resolution (or change to a different resolution) and click "connect" in the small window, I'll be in the xrdp mode. So all these work pretty good for me. Note: after I just created the 19.10 VM by "Quick Create..." and set up the host name and user name/password stuff, I rebooted the VM and when the VM booted up, I found the "Enhanced Session" was not clickable/usable -- this looks like a bug -- while I still don't know the root cause, it looks this can be resolved by manually adding the line "initrd /boot/initrd.img-5.3.0-23-generic #This line is added by Dexuan manually" into "/boot/grub/grub.cfg": menuentry 'Ubuntu' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-55829715-0091-4b86-b060-1cb88f342faf' { ... if [ "${initrdfail}" = 1 ]; then linux /boot/vmlinuz-5.3.0-23-generic root=PARTUUID=43e99d31-1277-402c-a13b-6cc8fb93169b ro quiet splash $vt_handoff initrd /boot/initrd.img-5.3.0-23-generic else linux /boot/vmlinuz-5.3.0-23-generic root=PARTUUID=43e99d31-1277-402c-a13b-6cc8fb93169b ro quiet splash $vt_handoff panic=-1 initrd /boot/initrd.img-5.3.0-23-generic #This line is added by Dexuan manually!!! fi initrdfail } With the addition of the line, it looks "GRUB_TIMEOUT=0" in "/etc/default/grub" is always really applied every time I reboot the VM. Without the line, it looks sometimes the grub timeout is 30 second and sometimes it's 0 second. BTW, I reported a bug for the missing initrd line a few weeks ago for a different issue: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1870189. I suggest you also manually add the line, then I guess you should be able to reliably toggle between xrdp mode and Xorg mode. Note: "/boot/grub/grub.cfg" is overwritten when update-grub is run by us or some automatic-update daemon, so we may want to check if the line is still there when we see something unexpected (i.e. unable to use xrdp mode, or see a grub timeout of 30s). I hope Bug 1870189 will be fixed by somebody ASAP... -- 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/1848534 Title: [Microsoft Hyper-V guest] System shows graphic artifacts for a moment, then text cursor for about minute and then starts Status in gdm3 package in Ubuntu: Confirmed Status in linux package in Ubuntu: Confirmed Bug description: AFter upgrade system shows graphic artefacts for a moment and then text cursor for about minute (it looks like hanged) and then starts. In 19.04 startup required 1 or 2 seconds. ProblemType: Bug DistroRelease: Ubuntu 19.10 Package: ubuntu-release-upgrader-core 1:19.10.15 ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1 Uname: Linux 5.3.0-18-generic x86_64 ApportVersion: 2.20.11-0ubuntu8 Architecture: amd64 CrashDB: ubuntu CurrentDesktop: ubuntu:GNOME Date: Thu Oct 17 17:42:27 2019 InstallationDate: Installed on 2019-07-04 (104 days ago) InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416) PackageArchitecture: all SourcePackage: ubuntu-release-upgrader Symptom: dist-upgrade UpgradeStatus: Upgraded to eoan on 2019-10-17 (0 days ago) VarLogDistupgradeLspcitxt: VarLogDistupgradeXorgFixuplog: INFO:root:/usr/bin/do-release-upgrade running INFO:root:No xorg.conf, exiting --- ProblemType: Bug ApportVersion: 2.20.11-0ubuntu8 Architecture: amd64 AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log' CompositorRunning: None CurrentDesktop: ubuntu:GNOME DistUpgraded: 2019-10-17 17:03:47,139 DEBUG Running PostInstallScript: './xorg_fix_proprietary.py' DistroCodename: eoan DistroRelease: Ubuntu 19.10 DistroVariant: ubuntu ExtraDebuggingInterest: Yes GraphicsCard: InstallationDate: Installed on 2019-07-04 (105 days ago) InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416) IwConfig: eth0 no wireless extensions. lo no wireless extensions. Lspci: Lsusb: Error: command ['lsusb'] failed with exit code 1: MachineType: Microsoft Corporation Virtual Machine Package: xorg-server (not installed) ProcFB: 0 hyperv_fb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-18-generic root=UUID=17409d40-25e9-4051-9fd9-758e2a02ebc3 ro quiet splash video=hyperv_fb:1900x900 elevator=noop vt.handoff=7 ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1 RelatedPackageVersions: linux-restricted-modules-5.3.0-18-generic N/A linux-backports-modules-5.3.0-18-generic N/A linux-firmware 1.183 RfKill: Tags: eoan ubuntu Uname: Linux 5.3.0-18-generic x86_64 UpgradeStatus: Upgraded to eoan on 2019-10-17 (0 days ago) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 01/30/2019 dmi.bios.vendor: Microsoft Corporation dmi.bios.version: Hyper-V UEFI Release v4.0 dmi.board.asset.tag: None dmi.board.name: Virtual Machine dmi.board.vendor: Microsoft Corporation dmi.board.version: Hyper-V UEFI Release v4.0 dmi.chassis.asset.tag: 2831-3616-6111-5725-4803-1162-28 dmi.chassis.type: 3 dmi.chassis.vendor: Microsoft Corporation dmi.chassis.version: Hyper-V UEFI Release v4.0 dmi.modalias: dmi:bvnMicrosoftCorporation:bvrHyper-VUEFIReleasev4.0:bd01/30/2019:svnMicrosoftCorporation:pnVirtualMachine:pvrHyper-VUEFIReleasev4.0:rvnMicrosoftCorporation:rnVirtualMachine:rvrHyper-VUEFIReleasev4.0:cvnMicrosoftCorporation:ct3:cvrHyper-VUEFIReleasev4.0: dmi.product.family: Virtual Machine dmi.product.name: Virtual Machine dmi.product.sku: None dmi.product.version: Hyper-V UEFI Release v4.0 dmi.sys.vendor: Microsoft Corporation version.compiz: compiz N/A version.libdrm2: libdrm2 2.4.99-1ubuntu1 version.libgl1-mesa-dri: libgl1-mesa-dri 19.2.1-1ubuntu1 version.libgl1-mesa-glx: libgl1-mesa-glx N/A version.xserver-xorg-core: xserver-xorg-core 2:1.20.5+git20191008-0ubuntu1 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.0.1-1ubuntu1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20190815-1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1848534/+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