I had strange horizontal flickering after upgrading to Ubuntu 24.10. The intel_iommu=igfx_off option solved this for me.
❰peter❙~❱✔≻ cat /proc/cmdline BOOT_IMAGE=/vmlinuz-6.11.0-9-generic root=/dev/mapper/vgubuntu-root ro intel_iommu=igfx_off quiet splash crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M vt.handoff=7 ❰peter❙~❱✔≻ uname -a Linux peter-laptop 6.11.0-9-generic #9-Ubuntu SMP PREEMPT_DYNAMIC Mon Oct 14 13:19:59 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux ❰peter❙~❱✔≻ lspci -nnk | grep -A3 VGA 00:02.0 VGA compatible controller [0300]: Intel Corporation Alder Lake-UP3 GT2 [Iris Xe Graphics] [8086:46a8] (rev 0c) Subsystem: Dell Device [1028:0b0b] Kernel driver in use: i915 Kernel modules: i915, xe BIOS Information Vendor: Dell Inc. Version: 1.26.0 Release Date: 08/14/2024 System Information Manufacturer: Dell Inc. Product Name: Latitude 7430 Processor Information Socket Designation: U3E1 Type: Central Processor Family: Core i7 Manufacturer: Intel(R) Corporation -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2062951 Title: Random flickering with Intel i915 (Gen9 GPUs in 6th-8th gen CPUs) on Linux 6.8 To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/2062951/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs