The problem is that Xfwm's built-in compositor and virgl don't play nice together.
Work-around: Boot the VM with virgl=off (on the video device) or gl=off (on the display), run xfwm4-tweaks-settings in the VM, select the "Compositor" tab, and uncheck "Enable display compositing". Then shut down the VM and re-enable virgl. picom works with Xfwm and doesn't seem to have the same issues, so if you want a compositor, install/use picom instead of using Xfwm's built- in compositor: https://wiki.archlinux.org/index.php/Picom -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to lightdm in Ubuntu. https://bugs.launchpad.net/bugs/1868780 Title: [virtio] Xubuntu 20.04 - Blank screen after login Status in lightdm package in Ubuntu: New Bug description: Both on Xubuntu 20.04 23rd March and 24th March daily build. Using Martin Wimpress QuickEMU setup. Installation part of xubuntu is working fine. But after install and reboot, you get the login box. I type in the password for the user and then just get a black screen and mouse cursor, no other error boxes or gui. Have tested my QuickEMU setup on ubuntu-mate and do not see this issue, only on Xubuntu daily builds do I see this issue. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: xorg 1:7.7+19ubuntu14 ProcVersionSignature: Ubuntu 5.4.0-18.22-generic 5.4.24 Uname: Linux 5.4.0-18-generic x86_64 ApportVersion: 2.20.11-0ubuntu21 Architecture: amd64 BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log' Date: Tue Mar 24 16:40:12 2020 DistUpgraded: Fresh install DistroCodename: focal DistroVariant: ubuntu ExtraDebuggingInterest: Yes, if not too technical GraphicsCard: Red Hat, Inc. Virtio GPU [1af4:1050] (rev 01) (prog-if 00 [VGA controller]) Subsystem: Red Hat, Inc. Virtio GPU [1af4:1100] InstallationDate: Installed on 2020-03-24 (0 days ago) InstallationMedia: Xubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200324) Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 003: ID 0627:0001 Adomax Technology Co., Ltd QEMU USB Tablet Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd QEMU USB Keyboard Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Lsusb-t: /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/8p, 5000M /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/8p, 480M |__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 480M |__ Port 2: Dev 3, If 0, Class=Human Interface Device, Driver=usbhid, 480M MachineType: QEMU Standard PC (Q35 + ICH9, 2009) ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-18-generic root=UUID=4b1c21e9-1325-435b-9ade-04263b901e6d ro quiet splash vt.handoff=7 SourcePackage: xorg UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/01/2014 dmi.bios.vendor: SeaBIOS dmi.bios.version: rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org dmi.chassis.type: 1 dmi.chassis.vendor: QEMU dmi.chassis.version: pc-q35-4.2 dmi.modalias: dmi:bvnSeaBIOS:bvrrel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org:bd04/01/2014:svnQEMU:pnStandardPC(Q35+ICH9,2009):pvrpc-q35-4.2:cvnQEMU:ct1:cvrpc-q35-4.2: dmi.product.name: Standard PC (Q35 + ICH9, 2009) dmi.product.version: pc-q35-4.2 dmi.sys.vendor: QEMU version.compiz: compiz N/A version.libdrm2: libdrm2 2.4.100-4 version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.0-1ubuntu1 version.libgl1-mesa-glx: libgl1-mesa-glx N/A version.xserver-xorg-core: xserver-xorg-core 2:1.20.7-2ubuntu2 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1 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/lightdm/+bug/1868780/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
