intel_idle.max_cstate=4 definitely not working for me so will try
intel_idle.max_cstate=2 as folks have noted and see what occurs
00:02.0 VGA compatible controller: Intel Corporation CometLake-H GT2 [UHD
Graphics] (rev 05) (prog-if 00 [VGA controller])
DeviceName: Onboard IGD
Subsystem: Hewlett-Packard Company CometLake-H GT2 [UHD Graphics]
Flags: bus master, fast devsel, latency 0, IRQ 218, IOMMU group 0
Memory at df000000 (64-bit, non-prefetchable) [size=16M]
Memory at a0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 3000 [size=64]
Expansion ROM at 000c0000 [virtual] [disabled] [size=128K]
Capabilities: [40] Vendor Specific Information: Len=0c <?>
Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
Capabilities: [ac] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Capabilities: [100] Process Address Space ID (PASID)
Capabilities: [200] Address Translation Service (ATS)
Capabilities: [300] Page Request Interface (PRI)
Kernel driver in use: i915
Kernel modules: i915
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https://bugs.launchpad.net/bugs/2062951
Title:
Random flickering with Intel i915 on Linux 6.8 (Ubuntu 24.04)
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