Re: CpuFreq Laptop Scaling broken?

[Viresh Kumar <viresh.kumar@linaro.org>]

On 25 August 2014 19:32, Harry van Haaren <harryhaaren@gmail.com> wrote:
> On Mon, Aug 25, 2014 at 2:55 PM, Viresh Kumar <viresh.kumar@linaro.org> wrote:
>> You tried both these as root? Even 'sudo' may not work..
> Yes, the original output was all as root (not sudo, genuine root).
>
>> I haven't seen the rt code since sometime, what tag should I look at ?
> I'm running 3.14.12-rt9-1-rt  (as packaged for Arch here:
> https://aur.archlinux.org/packages/linux-rt )

I don't have a clue of what's going wrong here..

But my guess would be that something is not working with locking, as that's
one of the main difference between rt and non-rt kernels.

Can you try to debug it with some prints?

The functions  of interest would be, drivers/cpufreq/cpufreq.c:
- static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf)
- static ssize_t store_scaling_governor(struct cpufreq_policy *policy,
const char *buf, size_t count)

Try to add some prints there while returning errors and then try to change
governor from userspace and things might get somewhat better then..

--
viresh