I tried the ubuntu 20.04 live cd today and the screen flicker re- appeard. So: Ubuntu 18.04: no screen flicker Kubuntuu 18.04: screen flicker Ubuntu 20.04: screen flicker Kubuntu 20.04: screen flicker
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1875649 Title: [Ice Lake] Screen flickering in Kubuntu 20.04 on Lenovo Yoga C940 14-IIL Status in linux package in Ubuntu: Confirmed Bug description: Screen flickering in Kubuntu 20.04 on Lenovo Yoga C940 14-IIL I am filing this bug again in accordance with: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1875073/comments/3 I've deleted the repository and checked again, and the bug still persists. Old bug report: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1875073 My screen flickers on Kubuntu 20.04LTS. See: https://imgur.com/a/FoWI1sp Also affected: Kubuntu 19.10 Fedora 31 System: inxi -Gxxx Graphics: Device-1: Intel Iris Plus Graphics G7 vendor: Lenovo driver: i915 v: kernel bus ID: 00:02.0 chip ID: 8086:8a52 Display: x11 server: X.Org 1.20.8 driver: modesetting compositor: kwin_x11 resolution: 1920x1080~60Hz OpenGL: renderer: Mesa Intel Iris Plus Graphics (ICL GT2) v: 4.6 Mesa 20.0.4 direct render: Yes Reproduction scenario's: 1) Starting Kubuntu, screen flickers a couple of times during startup and turns black for multiple seconds. 2) Start a youtube video, near-constant flickering. Audio works fine. 3) Open up various applications. Screen starts flickering every now and then. 4) Leave pc unattended for a long time, screen starts flickering sporadically. Things I tried: * Use various kernels * linux kernel 3.4, 3.5, 3.6, 3.7rc2 * Ubuntu port of linux kernel 3.4.0-26-generic + patch https://gitlab.freedesktop.org/jkrzyszt/i915/-/commit/1ee48a61aa57dbdbc3cd2808d8b28df40d938e44 * intel-drm-next (kernel panic) * Oibaf PPA * various kernel parameters What does work: * When using windows, the screen works. So no hardware error. * When using "nomodeset" kernel parameter Kubuntu 20.04 works, but then there's no sound or hardware acceleration. What I think is happening: i915 is apperantly an unstable driver for eDP 1.4 screens. That, in combination with a 10'th gen intel cpu is not a good combination. According to dmesg the firmware of sof-audio-pci is restarting. [ 324.775087] sof-audio-pci 0000:00:1f.3: error: no reply expected, received 0x0 [ 324.866267] sof-audio-pci 0000:00:1f.3: firmware boot complete Could the audio part of the eDP connection be breaking because of an issue similar to the patch that is mentioned earlyer? 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 CasperMD5CheckResult: skip CompositorRunning: None Date: Tue Apr 28 15:31:27 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 (3 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 2.4.101-2 version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.4-2ubuntu1 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/linux/+bug/1875649/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
