Public bug reported: Description: Since upgrading to kernel 6.17, the following message appears on every boot: RDSEED32 is broken. Disabling the corresponding CPUID bit. System information:
Device: Framework Laptop 13 (AMD Ryzen AI 300 Series) OS: Ubuntu 24.04.4 LTS (Noble) Kernel: 6.17.0-35-generic linux-firmware: 20240318.git3b128b60-0ubuntu2.27 Root cause: This is a known AMD hardware bug affecting Zen 5 processors, documented in AMD security bulletin SB-7055. The kernel correctly detects and disables the broken instruction as a workaround, hence the boot message. The upstream fix was added to linux-firmware in November 2025: https://gitlab.com/kernel-firmware/linux- firmware/-/commit/6167e5566900cf236f7a69704e8f4c441bc7212a The relevant kernel patch adding microcode revision detection was merged the same month: https://lkml.iu.edu/hypermail/linux/kernel/2511.1/05352.html Problem: The Noble linux-firmware package is based on a March 2024 snapshot (20240318) and does not include the updated Zen 5 microcode that resolves SB-7055. The package is fully up to date for Noble, but the fix has not been backported. Expected outcome: The fixed microcode for affected Zen 5 models is backported into the Noble linux-firmware package, eliminating the boot warning. Workaround: None currently available for Ubuntu 24.04 LTS users without manually installing upstream linux-firmware. ** Affects: linux-firmware (Ubuntu) Importance: Undecided Status: New ** Tags: backport missing -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2156851 Title: RDSEED32 broken warning on boot for AMD Zen 5 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/2156851/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
