It appears you are using graphics packages from the 'oibaf' PPA, which is not supported and is known to be buggy.
Please remove that PPA from your system and if the problem persists then open a new bug. ** Changed in: xorg (Ubuntu) Status: New => Invalid -- 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/1875073 Title: Screen flickering in Kubuntu 20.04 on Lenovo Yoga C940 14-IIL Status in xorg package in Ubuntu: Invalid Bug description: I'm experiencing a problem extremely similar to https://gitlab.freedesktop.org/drm/intel/-/issues/272 My screen flickers too on a fresh install of Kubuntu 20.04LTS https://imgur.com/a/FoWI1sp Results of `inxi -Gx` ` Graphics: Device-1: Intel Iris Plus Graphics G7 vendor: Lenovo driver: i915 v: kernel bus ID: 00:02.0 Display: x11 server: X.Org 1.20.8 driver: modesetting resolution: 1920x1080~60Hz OpenGL: renderer: Mesa Intel Iris Plus Graphics (ICL GT2) v: 4.6 Mesa 20.1.0-devel (git-a64d266 2020-04-25 focal-oibaf-ppa) direct render: Yes ` I've tried 915.enable_psr=0 as a boot parameter, didn't work. nomodeset does get me into a bootable image, but I'm looking into getting a working driver. Fedora 31 was having a similar issue, there was barely any flickering up untill some recent kernel updates. (about a couple small ones every 10 minutes or so) Kubuntu 19.10 was quite stable too, untill I installed a lenovo provided firmware update (from AUCN45WW to AUCN54WW), which made it slightly worse. I also tried a couple of other kernel parameters that haven't had any effect. Running kernel 5.6 on Kubuntu did have thesame issue as regular kubuntu 20.04. Running kernel 5.7-rc2 did fix the problem, but networking and sound was dead, so it's only half a solution. I highly suspect it's an issue with i915, but I don't know how I would trace it down. I don't know why and I don't know how. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: xorg 1:7.7+19ubuntu14 ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30 Uname: Linux 5.4.0-26-generic x86_64 ApportVersion: 2.20.11-0ubuntu27 Architecture: amd64 BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log' CasperMD5CheckResult: skip CompositorRunning: None CurrentDesktop: KDE Date: Sat Apr 25 20:49:36 2020 DistUpgraded: Fresh install DistroCodename: focal DistroVariant: ubuntu GraphicsCard: Intel Corporation Iris Plus Graphics G7 [8086:8a52] (rev 07) (prog-if 00 [VGA controller]) Subsystem: Lenovo Iris Plus Graphics G7 [17aa:3801] InstallationDate: Installed on 2020-04-25 (0 days ago) InstallationMedia: Kubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423) MachineType: LENOVO 81Q9 ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-26-generic root=UUID=5d977dfa-1fa5-412b-9d83-644cef18af6e ro rootflags=subvol=@ quiet splash vt.handoff=7 SourcePackage: xorg Symptom: display UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 01/09/2020 dmi.bios.vendor: LENOVO dmi.bios.version: AUCN54WW dmi.board.asset.tag: NO Asset Tag dmi.board.name: LNVNB161216 dmi.board.vendor: LENOVO dmi.board.version: SDK0J40709 WIN dmi.chassis.asset.tag: NO Asset Tag dmi.chassis.type: 31 dmi.chassis.vendor: LENOVO dmi.chassis.version: Lenovo Yoga C940-14IIL dmi.modalias: dmi:bvnLENOVO:bvrAUCN54WW:bd01/09/2020:svnLENOVO:pn81Q9:pvrLenovoYogaC940-14IIL:rvnLENOVO:rnLNVNB161216:rvrSDK0J40709WIN:cvnLENOVO:ct31:cvrLenovoYogaC940-14IIL: dmi.product.family: Yoga C940-14IIL dmi.product.name: 81Q9 dmi.product.sku: LENOVO_MT_81Q9_BU_idea_FM_Yoga C940-14IIL dmi.product.version: Lenovo Yoga C940-14IIL dmi.sys.vendor: LENOVO version.compiz: compiz N/A version.libdrm2: libdrm2 2.4.101+git2004241830.bf63f8~oibaf~f version.libgl1-mesa-dri: libgl1-mesa-dri 20.1~git2004250730.a64d26~oibaf~f version.libgl1-mesa-glx: libgl1-mesa-glx N/A version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2 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+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/xorg/+bug/1875073/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : email@example.com Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp