[elrepo] Where should I go to find kernel issues?

[Alan Bartlett]

On 14 January 2014 20:04, Joshua Kramer <joskra42.list at gmail.com> wrote:
> Hello All,
>
> I have a weird hardware issue with both the ml and lt kernels on CentOS 6.
> How can I go about debugging this?
>
> I have an HP laptop that I just re-installed CentOS 6 on.  Using the stock
> 2.6 kernel, 95% of the hardware works.  However, if I use a 3.10/12 (either
> ml or lt) kernel, 99% of the hardware works.  Almost.
>
> With the 3.10/12 kernel, I cannot start cpuspeed.  It cannot write to the
> file
>
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
>
> With the 2.6 kernel, cpuspeed runs just fine.

For the distro kernel, kernel-lt and kernel-ml, respectively, what
does cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor return?

> I'm guessing that the 3.10/12 kernel doesn't have the right cpu speed
> scaling drivers compiled in.

Highly unlikely and probably an invalid assumption!

> Does anyone know how I can tell which driver
> the 2.6 kernel uses for this, so I can build it for the 3.10/12 kernel?

I'll suggest that you take the configuration file for the distro
kernel, kernel-lt & kernel-ml and perform the following transformation
--

grep -v '^#' config-* | sort | uniq > sorted-config

Then perform a "sdiff" of each pair of sorted-config files.

If you discover an apparent defect in the configuration of either the
kernel-lt or kernel-ml packages, then please open an RFE at the ELRepo
bug tracker [1] and I will take it from there.

Alan.

[1] http://elrepo.org/bugs/main_page.php