I tried getting a debug log of drm.i915 using "drm.debug=0x06" as a kernel parameter. In the log dmesg.txt there's a "hotplug event received" in batches, everytime one of those appears, my screen flickers. Which is weird to me since I don't unplug my fixed laptop screen. It's likely that this is not a hardware faillure since this problem is not reproducible on Windows.
** Attachment added: "dmesg log with kernel parameter "drm.debug=0x06"" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1875073/+attachment/5361005/+files/dmesg.txt -- 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: New 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 : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
