On Tue, Mar 25, 2014 at 3:18 PM, <rosslagerwall@xxxxxxxxx> wrote: > On Tue, Mar 25, 2014 at 03:04:16PM -0700, Vinson Lee wrote: >> Hi. >> >> Please backport upstream commit 8673b83bf2f013379453b4779047bf3c6ae387e4 >> "acpi-cpufreq: set current frequency based on target P-State" to stable >> kernels 3.7 and earlier. This patch enables the kernel to control >> P-states on several platforms. Without this patch, the kernel was unable >> to control P-states on the same platforms. >> >> The upstream patch cleanly applies to 3.7. >> >> A backported patch is needed with the removal of SYSTEM_AMD_MSR_CAPABLE >> for kernels 3.6 and earlier. >> > > I seem to recall that the problem was a regression introduced by commit > 5a1c0228 (cpufreq: Avoid calling cpufreq driver's target() routine if > target_freq == policy->cur) which was introduced in the 3.8 cycle. Are > you sure it is necessary for kernels < 3.8? > > Regards > -- > Ross Lagerwall This specific patch allows P-states to work with the 3.4 kernel on several hardware platforms. Perhaps this is not the correct patch to backport. However, P-states are not working properly with the 3.4 kernel, even though it does not have the regression commit 5a1c0228 "cpufreq: Avoid calling cpufreq driver's target() routine if target_freq == policy->cur" backported. Cheers, Vinson -- To unsubscribe from this list: send the line "unsubscribe cpufreq" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
