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Why not just move to > 6.12.y instead as you know that works. The original problem was reported by me on 6.6.y. I tested the patch provided by Borislav on 6.6.y. As mentioned, a small change is required to make it compile, but this is a nonfunctional change in the tested code path and so didn't influence test results. I can therefore say with certainty that the fix is required on 6.6.y . In these discussions, I requested Borislav if the patch could also be submitted for 6.6.y, and made him aware that variable 'bsp_cpuid_1_eax' used in the patch does not yet exist in that branch. He replied [1]: "That's fine - stable folks usually know what to pick up. If not, I'll provide backports." I cannot currently move to 6.12 for these systems, this has other consequences and testing efforts. Thanks, Thomas [1] https://lore.kernel.org/lkml/20241119111728.GAZzxzyHj8U99cEHQ8@fat_crate.local/