Hello, Below is a one line patch to possibly fix this bug:
http://bugs.gentoo.org/show_bug.cgi?id=178585 http://bugzilla.kernel.org/show_bug.cgi?id=8075 If the kernel is configured with: CONFIG_X86_POWERNOW_K8=y CONFIG_X86_ACPI_CPUFREQ=m Which is currently an allowed configuration, the powernow-k8 driver on an SMP system will fail with a warning like: powernow-k8: Found 4 Dual Core AMD Opteron(tm) Processor 285 processors (version 2.00.00) powernow-k8: MP systems not supported by PSB BIOS structure powernow-k8: MP systems not supported by PSB BIOS structure powernow-k8: MP systems not supported by PSB BIOS structure powernow-k8: MP systems not supported by PSB BIOS structure Which mimics that failure you get when powernow/cool'n'quiet is disabled in the BIOS. I don't know if this config combination is valid on a uniprocessor system so this dependency may need to be enforced only if SMP in enabled. The other powernow-* drivers likely have the same requirements as -k8 but I am unable to test them. Signed-off-by: Joshua Hoblitt <[EMAIL PROTECTED]> -- Kconfig | 1 + 1 file changed, 1 insertion(+) --- linux-2.6.21.1.orig/arch/i386/kernel/cpu/cpufreq/Kconfig 2007-04-27 11:49:26.000000000 -1000 +++ linux-2.6.21.1/arch/i386/kernel/cpu/cpufreq/Kconfig 2007-05-15 14:48:50.000000000 -1000 @@ -82,6 +82,7 @@ config X86_POWERNOW_K8 tristate "AMD Opteron/Athlon64 PowerNow!" select CPU_FREQ_TABLE depends on EXPERIMENTAL + depends on X86_ACPI_CPUFREQ help This adds the CPUFreq driver for mobile AMD Opteron/Athlon64 processors. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/