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One of them boots fine, the other one does not. One is a Dell R7525, cpu: 2 socket AMD EPYC 7763 64-Core Processor and it boots fine on -git. The other is a Dell R7625, cpu: 2 socket AMD EPYC 9754 128-Core Processor and that one does not boot. Just get a black screen when the kernel should load. Because I didn't have much to go on here, I bisected the issue, and it came up with: 94838d230a6c835ced1bad06b8759e0a5f19c1d3 is the first bad commit commit 94838d230a6c835ced1bad06b8759e0a5f19c1d3 (HEAD) Author: Borislav Petkov Date: Thu Jul 25 13:20:37 2024 +0200 x86/microcode/AMD: Use the family,model,stepping encoded in the patch ID which seems plausible. And indeed, reverting that commit (and its fixup) on top of current -git does indeed solve it. Happy to test patches, unfortunately I don't have much to offer up in terms of oops or whatever to help diagnose this. In lieu of instant ideas to prevent this issue on -rc1, perhaps a revert? -- Jens Axboe