If the cursor still works then that's Xorg which is still working and only gnome-shell has frozen or crashed, so...
Thank you for taking the time to report this bug and helping to make Ubuntu better. It sounds like some part of the system has crashed. To help us find the cause of the crash please follow these steps: 1. Look in /var/crash for crash files and if found run: ubuntu-bug YOURFILE.crash Then tell us the ID of the newly-created bug. 2. If step 1 failed then look at https://errors.ubuntu.com/user/ID where ID is the content of file /var/lib/whoopsie/whoopsie-id on the machine. Do you find any links to recent problems on that page? If so then please send the links to us. 3. If step 2 also failed then apply the workaround from bug 994921, reboot, reproduce the crash, and retry step 1. Please take care to avoid attaching .crash files to bugs as we are unable to process them as file attachments. It would also be a security risk for yourself. ** Summary changed: - Xorg freeze + Screen freeze ** Package changed: xorg (Ubuntu) => gnome-shell (Ubuntu) ** Changed in: gnome-shell (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1887718 Title: Screen freeze Status in gnome-shell package in Ubuntu: Incomplete Bug description: Freezes randomly without any traceable pattern. Windows become unresponsive while the cursor works. To unfreeze I have to press the OFF button of my HP ProBook and then click on "Cancel" in the shutdown dialogue. That unfreezes the windows. May happen several times per session, may not happen at all. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: xorg 1:7.7+19ubuntu14 ProcVersionSignature: Ubuntu 5.4.0-40.44-generic 5.4.44 Uname: Linux 5.4.0-40-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.3 Architecture: amd64 BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log' CasperMD5CheckResult: skip CompositorRunning: None CurrentDesktop: ubuntu:GNOME Date: Wed Jul 15 22:32:43 2020 DistUpgraded: Fresh install DistroCodename: focal DistroVariant: ubuntu ExtraDebuggingInterest: Yes GraphicsCard: Intel Corporation HD Graphics 620 [8086:5916] (rev 02) (prog-if 00 [VGA controller]) Subsystem: Hewlett-Packard Company HD Graphics 620 [103c:822c] InstallationDate: Installed on 2020-06-19 (26 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423) Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 004: ID 138a:003f Validity Sensors, Inc. VFS495 Fingerprint Reader Bus 001 Device 003: ID 8087:0a2a Intel Corp. Bus 001 Device 002: ID 05c8:03a0 Cheng Uei Precision Industry Co., Ltd (Foxlink) HP HD Camera Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: HP HP ProBook 430 G4 ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-40-generic root=UUID=36191f51-931b-47be-bfdb-1553e0425aad ro quiet splash vt.handoff=7 SourcePackage: xorg Symptom: display Title: Xorg freeze UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 12/05/2016 dmi.bios.vendor: HP dmi.bios.version: P85 Ver. 01.03 dmi.board.name: 822C dmi.board.vendor: HP dmi.board.version: KBC Version 42.61 dmi.chassis.asset.tag: 5CD7065D4K dmi.chassis.type: 10 dmi.chassis.vendor: HP dmi.modalias: dmi:bvnHP:bvrP85Ver.01.03:bd12/05/2016:svnHP:pnHPProBook430G4:pvr:rvnHP:rn822C:rvrKBCVersion42.61:cvnHP:ct10:cvr: dmi.product.family: 103C_5336AN HP ProBook dmi.product.name: HP ProBook 430 G4 dmi.product.sku: Y7Z51EA#ACB dmi.sys.vendor: HP version.compiz: compiz N/A version.libdrm2: libdrm2 2.4.101-2 version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.8-0ubuntu1~20.04.1 version.libgl1-mesa-glx: libgl1-mesa-glx 20.0.8-0ubuntu1~20.04.1 version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2.1 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+git20200226-1 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/gnome-shell/+bug/1887718/+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