powernow-k8 transition frequency failed

Ubuntu 11.10 Desktop 64bit 에서 발생하고 있고 AMD 4200+x2 이다.
대충 찾아봐도 Cool'n'Quiet 관련해서 문제라는 이야기가 있는데
내가 그걸 안켜놨던가...?

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2012.4.3 추가

위의 에러는 ACPI 관련해서 문제가 발생하는 것으로 Cool'n'Quiet를 켜놓으면 발생한다고 한다.

On AMD with Xen, the cpuidle is set to use the halt one (this is b/c the halt ends up doing a yield hypercall) - look in setup.c - and the hypervisor does the appropiate halt operation (MWAIT, halt, etc, or schedules another guest on the CPU). Anyhow, to not have the cpuidle trying to activate, the "boot_option_idle_override" is set. Therefore, the ACPI _PSS driver (processor.ko) ends up bailing out, b/c of that parameter. As such the "older" AMD pstate driver is invoked (powernow-k8), and the older driver attempts to use ACPI _PSD - but only if in UP mode, or it attempts to use the voltage tables - which are k8 or earlier. To detect that, it use the MSR (sadly not CPUID values), which Xen traps and returns 00, which the powernow-k8 driver interprets as "buggy hardware - can't use". Which is exactly what you are seeing. I believe (and sadly I don't have the hardware to check this - but I think I saw the somebody using it) if you were running on K8 hardware - it ought to work. Solution: Have the ACPI processor driver cooperate with Xen. Patches are in the queue for it (if you are really interested look in oss.oracle.com/kwilk/xen.git #devel/acpi-cpufreq.v2 - but they are not yet upstream-able material. Actually, they are quite ugly). Other solution: The "easy" option for right now would be to do what Dave suggest until the upstream patches are ready and reviewed. --- Just to add, per Konrad's comment above. This issue also occurs on K8 hardware (Athlon II 4850e) with powernow enabled in the BIOS (aka Cool'n'quiet). Disabling Cool'n'quiet removes the messages. I just performed the standard Desktop install of the F16 Beta, installed Xen, rebuilt the grub menu, and rebooted to dom0. Syslog is full of the same message per this bug. It would be great to see Dave's solution (see comment 5 above); an interim kernel-patch solution to this bug - as it currently stands dom0 functionality is largely unuseable.   [링크 : https://bugzilla.redhat.com/show_bug.cgi?id=739159]

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2012.4.4 추가
확실히 Cool'n'Quiet를 끄니 에러가 발생하진 않음.