This is a BIOS bug. If you look more closely to the content of /proc/cpuinfo for the affected cores, you'll see that there are fewer reported CPU features, including the 'est' feature which is Enhanced SpeedStep. If you post what cpuid -r command dumps, you will probably see that the affected CPU cores report incorrect CPU features (CPUID leaf 1, that's EAX=1, features reported in ECX). This is caused by the AV69 / AX64 revision E0 CPU errata (L5430 is revE0, see the CPU signature 0x1067a) and the failure of the BIOS to update the microcode for all CPU cores (look at the dmesg log, microcode 0x0), before each revE0 core gets to initialize the PECI_CTL MSR. It may be that your BIOS doesn't contain the required microcode update. The same thing can be said about the revC0 microcode update (CPU signature 0x10676), but the revC0 is not affected by the errata. I have already investigated a case with an Abit IP35 motherboard, a revE0 Xeon CPU and a BIOS that contains the required microcode update, but which fails to update the microcode to cores 2,3 and 4, while the first core is a success. The only workaround I found was to modify the raw BIOS, not to write to the PECI_CTL MSR, and to disable all thermal control/protection, in the BIOS menu.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1367002 Title: Intel XEON L5430 is not supported To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cpufrequtils/+bug/1367002/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
