The screen flicker also happened to me after updating to 22.04. I think the cause for the error is actually Memtest86+. When I tried to do the fix by adding parameters to /etc/default/grub and update I got the following.
:~$ uname -a Linux alwayssk 5.15.0-50-generic #56-Ubuntu SMP Tue Sep 20 13:23:26 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux :~$ sudo update-grub Sourcing file `/etc/default/grub' Sourcing file `/etc/default/grub.d/init-select.cfg' Generating grub configuration file ... Found linux image: /boot/vmlinuz-5.15.0-50-generic Found initrd image: /boot/initrd.img-5.15.0-50-generic Found linux image: /boot/vmlinuz-5.15.0-48-generic Found initrd image: /boot/initrd.img-5.15.0-48-generic Memtest86+ needs a 16-bit boot, that is not available on EFI, exiting Warning: os-prober will be executed to detect other bootable partitions. Its output will be used to detect bootable binaries on them and create new boot entries. Adding boot menu entry for UEFI Firmware Settings ... done -- 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/1958191 Title: [i915] Screen flickering in Ubuntu 22.04 (until i915.enable_dc=0 intel_idle.max_cstate=2 are added) (fixed in 5.17.7 and later) Status in linux package in Ubuntu: Fix Released Bug description: Ubuntu 22.04 development branch on kernel 5.15.0-17-generic @ 18/1/2022 Booting into desktop gets heavy screen flickering and disforming (unusable) both booting on xorg and wayland on kernel 5.13 it did not occur so heavy (only little glitches once in a while see bug 1948778) adding the kernel paramater intel_idle.max_cstate=4 fixed this i had these same bugs on this machine before: https://bugs.launchpad.net/ubuntu/+source/linux-hwe/+bug/1838644 https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1948778 ProblemType: Bug DistroRelease: Ubuntu 22.04 Package: linux-image-5.15.0-17-generic 5.15.0-17.17 ProcVersionSignature: Ubuntu 5.15.0-17.17-generic 5.15.12 Uname: Linux 5.15.0-17-generic x86_64 ApportVersion: 2.20.11-0ubuntu75 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: lotuspsychje 1201 F.... pipewire-media- lotuspsychje 1207 F.... pulseaudio /dev/snd/seq: lotuspsychje 1193 F.... pipewire CasperMD5CheckResult: unknown CurrentDesktop: ubuntu:GNOME Date: Tue Jan 18 04:22:00 2022 Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 004: ID 8087:0025 Intel Corp. Wireless-AC 9260 Bluetooth Adapter Bus 001 Device 003: ID 04f2:b59e Chicony Electronics Co., Ltd Chicony USB2.0 Camera Bus 001 Device 002: ID 046d:c534 Logitech, Inc. Unifying Receiver Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: Notebook N7x0WU ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.15.0-17-generic root=UUID=a41247d1-3bc3-453e-849a-e07fdcca6201 ro quiet splash intel_idle.max_cstate=4 vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-5.15.0-17-generic N/A linux-backports-modules-5.15.0-17-generic N/A linux-firmware 1.204 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 01/07/2019 dmi.bios.release: 7.13 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 7.13 dmi.board.asset.tag: Tag 12345 dmi.board.name: N7x0WU dmi.board.vendor: Notebook dmi.board.version: Not Applicable dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: No Enclosure dmi.chassis.version: N/A dmi.ec.firmware.release: 7.14 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr7.13:bd01/07/2019:br7.13:efr7.14:svnNotebook:pnN7x0WU:pvrNotApplicable:rvnNotebook:rnN7x0WU:rvrNotApplicable:cvnNoEnclosure:ct10:cvrN/A:skuNotApplicable: dmi.product.family: Not Applicable dmi.product.name: N7x0WU dmi.product.sku: Not Applicable dmi.product.version: Not Applicable dmi.sys.vendor: Notebook To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1958191/+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
