<div dir="ltr"><div>You know, Rob, I was mistaken. elrepo offers two kernels: an lt kernel (version 3.10) and an ml kernel (version 3.12). I tried both of these kernels and have the same issue. The older kernels are 2.6.32, which is what RedHat 6 & friends ship with.<br>
<br></div>The laptop is an HP Pavilion dm4, with a dual-core i3. I'm guessing it's 3-4 years old; I got it as a refurb unit from Micro Center a couple years ago.<br></div><div class="gmail_extra"><br><br><div class="gmail_quote">
On Tue, Jan 14, 2014 at 12:50 PM, Rob Funk <span dir="ltr"><<a href="mailto:rfunk@funknet.net" target="_blank">rfunk@funknet.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="HOEnZb"><div class="h5">Joshua Kramer wrote:<br>
> I have an HP laptop that I just re-installed CentOS 6 on. Using the stock<br>
> 2.6 kernel, 95% of the hardware works. However, if I use a 3.1 kernel, 99%<br>
> of the hardware works. Almost.<br>
><br>
> With the 3.1 kernel, I cannot start cpuspeed. It cannot write to the file<br>
><br>
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor<br>
><br>
> With the 2.6 kernel, cpuspeed runs just fine.<br>
><br>
> I'm guessing that the 3.1 kernel provided by elrepo doesn't have the right<br>
> cpu speed scaling drivers compiled in. Does anyone know how I can tell<br>
> which driver the 2.6 kernel uses for this, so I can build it for the 3.1<br>
> kernel?<br>
<br>
</div></div>You might want to go newer than 3.1, since that dates back to Oct<br>
2011. They're up to 3.12 now.<br>
<br>
I did a google search for cpufreq on <a href="http://kernelnewbies.org" target="_blank">kernelnewbies.org</a>, and found that<br>
kernel 3.7 added a generic cpufreq driver and kernel 3.9 added a<br>
cpufreq driver for last year's cpus.<br>
<br>
It might also help to specify the specific 2.6 version (the earliest<br>
ones are ten years old) and the HP laptop model or vintage.<br>
<br>
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</blockquote></div><br></div>