Re: [PATCH] pmac: sound support for latest laptops

[Brian C <brianwc@berkeley.edu>]

Colin wrote:
[snip]
>> What is a safe temperature for the CPU? Could I just set the
>> cpu_limit to 55? If so, how would I do that?
>
>echo 5 > /sys/devices/temperatures/limit_adjust
>(this will add 5 to the default 50°C)
>
>I should give a look at Darwin's drivers to see whether default
>temperatures are different for your model, and adapt the driver if
>necessary.

Thanks. That makes the fan noise tolerable as the fan never goes above 
199 rpm with normal operation and the temp hovers at 61-62.

However, I discovered that I had not compiled in the userspace module 
for cpu frequency management, so the only scaling governor I had was 
"performance" which runs the processor at 1.5 GHz the whole time. By 
adding the userspace module I can also add the "powersave" scaling 
governor. I suspect this will help a lot. I'm recompiling now.

However, one thing that is clear is that when the processor runs at 
1.5Ghz (full-speed) for even a few minutes, the fan will ramp up to full 
speed and pretty much stay there forever. That's not particularly 
desirable, so perhaps investigating Darwin's approach is still a good idea.

Brian