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Subject[PATCH] drivers/cpufreq: Warn user when powernow-k8 tries to fall back to acpi-cpufreq and it is unavailable.
This patch is in reference to bug#:51741. (
powernow-k8 falls back to acpi-cpufreq if CPU is not supported. However, it states that acpi-cpufreq
has taken over even if acpi-cpufreq is not compiled in. This patch rewords the warning message to
clarify that the CPU is unsupported and prints a warning message when there is no acpi-cpufreq

Signed-off-by: Aravind Gopalakrishnan <>
drivers/cpufreq/powernow-k8.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/cpufreq/powernow-k8.c b/drivers/cpufreq/powernow-k8.c
index 056faf6..6fa58b4 100644
--- a/drivers/cpufreq/powernow-k8.c
+++ b/drivers/cpufreq/powernow-k8.c
@@ -1256,7 +1256,15 @@ static int __cpuinit powernowk8_init(void)
int rv;

if (static_cpu_has(X86_FEATURE_HW_PSTATE)) {
- pr_warn(PFX "this CPU is not supported anymore, using acpi-cpufreq instead.\n");
+ pr_warn(PFX
+ "this CPU is not supported anymore, use acpi-cpufreq instead"
+ "Look for message from acpi-cpufreq to ensure it is loaded."
+ ".\n");
+ pr_warn(PFX "acpi-cpufreq is disabled."
+ "Enable it in the config options to get frequency scaling.\n");
+ return -ENODEV;
return -ENODEV;

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