duh, typing too fast. Of course I meant xfwm4. ** Description changed:
Steps to reproduce 1. setup a virtual machine with GPU pass-through to a nvidia Quadro card (nvidia only supports passthrough to Quadro cards). Nvidia also recommends that the passed-through card has its ROM disabled in VM configuration, i.e. <rom bar='off'/> . Attached an example of such VM. 2. install vanilla Xubuntu 18.04, do not enable auto-login 3. install nvidia drivers, e.g. $ sudo add-apt-repository ppa:graphics-drivers/ppa $ sudo apt-get install nvidia-driver-410 4. reboot (the screen may be black until the greeter appears) 5. login 6. lock the screen back to the greeter $ light-locker-command --lock Now you have black screen and unresponsive keyboard, and also one more file in /var/crash . The only way to get to the greeter again is to run (from another session, e.g. ssh) $ sudo systemctl restart lightdm ... which will also kill all the sessions running under the login manger (including the one where we tried to lock the screen) I've found that this only happens with stock xfwm4 version 4.12 . If I - upgrade xfwm4 to version 4.13 (from Mint) the screen lock works as - expected, but this package is not in Ubuntu repo. + upgrade xfwm4 to version 4.13.1 (from ppa:xubuntu-dev/experimental) the + screen lock works as expected. So perhaps the problem is not with Xorg but with old xfwm4. I also tried other flavours of Ubuntu and IIRC also seen it in Lubuntu. At a stretch this could be called security vulnerability, because with this bug there is no way to lock the screen, hence users will always leave their session unlocked (or must log off) ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: xorg 1:7.7+19ubuntu7.1 ProcVersionSignature: Ubuntu 4.15.0-45.48-generic 4.15.18 Uname: Linux 4.15.0-45-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia .proc.driver.nvidia.gpus.0000.06.00.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0000:06:00.0' .proc.driver.nvidia.registry: Binary: "" .proc.driver.nvidia.version: NVRM version: NVIDIA UNIX x86_64 Kernel Module 410.78 Sat Nov 10 22:09:04 CST 2018 GCC version: gcc version 7.3.0 (Ubuntu 7.3.0-27ubuntu1~18.04) ApportVersion: 2.20.9-0ubuntu7.5 Architecture: amd64 BootLog: CompositorRunning: None Date: Mon Feb 11 09:14:54 2019 DistUpgraded: Fresh install DistroCodename: bionic DistroVariant: ubuntu DkmsStatus: nvidia, 410.78, 4.15.0-45-generic, x86_64: installed ExtraDebuggingInterest: Yes GraphicsCard: NVIDIA Corporation GM204GL [Quadro M5000] [10de:13f0] (rev a1) (prog-if 00 [VGA controller]) Subsystem: NVIDIA Corporation GM204GL [Quadro M5000] [10de:1152] InstallationDate: Installed on 2019-02-10 (0 days ago) InstallationMedia: Xubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725) MachineType: QEMU Standard PC (Q35 + ICH9, 2009) ProcEnviron: LANGUAGE=en_GB:en TERM=xterm-256color PATH=(custom, no user) LANG=en_GB.UTF-8 SHELL=/bin/zsh ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-45-generic root=UUID=16524009-5b46-4f13-918c-0dee6cce40fe ro console=tty0 console=ttyS0,115200n8 SourcePackage: xorg Symptom: display Title: Xorg crash UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 02/06/2015 dmi.bios.vendor: EFI Development Kit II / OVMF dmi.bios.version: 0.0.0 dmi.chassis.type: 1 dmi.chassis.vendor: QEMU dmi.chassis.version: pc-q35-3.1 dmi.modalias: dmi:bvnEFIDevelopmentKitII/OVMF:bvr0.0.0:bd02/06/2015:svnQEMU:pnStandardPC(Q35+ICH9,2009):pvrpc-q35-3.1:cvnQEMU:ct1:cvrpc-q35-3.1: dmi.product.name: Standard PC (Q35 + ICH9, 2009) dmi.product.version: pc-q35-3.1 dmi.sys.vendor: QEMU version.compiz: compiz N/A version.libdrm2: libdrm2 2.4.95-1~18.04.1 version.libgl1-mesa-dri: libgl1-mesa-dri 18.2.2-0ubuntu1~18.04.2 version.libgl1-mesa-glx: libgl1-mesa-glx 18.2.2-0ubuntu1~18.04.2 version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4.2 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20171229-1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1815429 Title: Xorg crash To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xfwm4/+bug/1815429/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
