I also update 6.8.0-45 (22.04) and use intel_iommu=igfx but not
completly solve the problem (seems it rare but happen)

00:02.0 VGA compatible controller: Intel Corporation Skylake GT2 [HD Graphics 
520] (rev 07) (prog-if 00 [VGA controller])
        DeviceName: Onboard IGD
        Subsystem: Hewlett-Packard Company EliteBook 840 G3
        Flags: bus master, fast devsel, latency 0, IRQ 132, IOMMU group 0
        Memory at e0000000 (64-bit, non-prefetchable) [size=16M]
        Memory at d0000000 (64-bit, prefetchable) [size=256M]
        I/O ports at 3000 [size=64]
        Expansion ROM at 000c0000 [virtual] [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: i915
        Kernel modules: i915

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https://bugs.launchpad.net/bugs/2062951

Title:
  Random flickering with Intel i915 (Gen9 GPUs in 6th-8th gen CPUs) on
  Linux 6.8

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