Alex can you please give this kernel a try: https://people.canonical.com/~khfeng/lp1936708/
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-oem-5.13 in Ubuntu. https://bugs.launchpad.net/bugs/1936708 Title: Wobbly graphics on built-in display since linux- image-5.11.0-22-generic Status in linux package in Ubuntu: Confirmed Status in linux-oem-5.13 package in Ubuntu: Invalid Status in linux source package in Focal: Won't Fix Status in linux-oem-5.13 source package in Focal: Fix Committed Status in linux source package in Hirsute: Confirmed Status in linux-oem-5.13 source package in Hirsute: Invalid Status in linux source package in Impish: Confirmed Status in linux-oem-5.13 source package in Impish: Invalid Bug description: == SRU Justification == [Impact] Wobbly graphics after a kernel update. [Fix] Older panels may require more bandwidth then advertised, so we need to use max params for them. [Test] Multiple users tested with positive result. [Where problems could occur] This patch reverts to the old behavior, which is to use max parameters, for older panels. If there's any new panel reports with older DP version, this might change the behavior on it. == Original Bug Report == Lenovo laptop with Intel + Nvidia graphics. Since booting from linux-image-5.11.0-22-generic, the built-in display is unusable, with wobbling horizontal stripes from the disk decryption prompt onwards: https://www.youtube.com/watch?v=LyRTuPzCe2I HDMI output works fine. If I boot from linux-image-5.11.0-18-generic instead, all is well. If I use Recovery mode with linux-image-5.11.0-22-generic and continue bootup, it's usable but there's no HDMI output. I think others may be having this issue too: https://askubuntu.com/questions/1351188/weird-graphical-glitches-appears-only-on-integrated-display-on-any-ubuntu-base# ProblemType: Bug DistroRelease: Ubuntu 21.04 Package: linux-image-5.11.0-22-generic 5.11.0-22.23 ProcVersionSignature: Ubuntu 5.11.0-22.23-generic 5.11.21 Uname: Linux 5.11.0-22-generic x86_64 ApportVersion: 2.20.11-0ubuntu65.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: alex 1598 F.... pulseaudio /dev/snd/controlC0: alex 1598 F.... pulseaudio CasperMD5CheckResult: unknown CurrentDesktop: KDE Date: Sat Jul 17 09:50:31 2021 InstallationDate: Installed on 2021-01-03 (194 days ago) InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022) MachineType: LENOVO 80DU ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.11.0-22-generic root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-5.11.0-22-generic N/A linux-backports-modules-5.11.0-22-generic N/A linux-firmware 1.197.2 SourcePackage: linux UpgradeStatus: Upgraded to hirsute on 2021-05-22 (55 days ago) dmi.bios.date: 08/18/2014 dmi.bios.release: 1.49 dmi.bios.vendor: LENOVO dmi.bios.version: 9ECN31WW(V1.14) dmi.board.asset.tag: 31900058WIN dmi.board.name: Lenovo Y70-70 Touch dmi.board.vendor: LENOVO dmi.board.version: 31900058WIN dmi.chassis.asset.tag: 31900058WIN dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Lenovo Y70-70 Touch dmi.ec.firmware.release: 1.49 dmi.modalias: dmi:bvnLENOVO:bvr9ECN31WW(V1.14):bd08/18/2014:br1.49:efr1.49:svnLENOVO:pn80DU:pvrLenovoY70-70Touch:rvnLENOVO:rnLenovoY70-70Touch:rvr31900058WIN:cvnLENOVO:ct10:cvrLenovoY70-70Touch: dmi.product.family: IDEAPAD dmi.product.name: 80DU dmi.product.sku: LENOVO_MT_80DU_BU_idea_FM_Lenovo Y70-70 Touch dmi.product.version: Lenovo Y70-70 Touch dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1936708/+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
