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Re: dbcool on iBook G4 late 2004 doesn't work
On Sat, 11 Oct 2008, Michael wrote:
Also, I would expect the fans to run at full speed until you've used the
various sysctl(8) variables to tune the PWM algorithm. See 'sysctl
hw.dbcool' and 'man 4 dbcool' for description of the sysctl stuff.
Umm, no. The iBook's firmware programs reasonable temperature thresholds into
the chip ( IIRC 85C for the CPU, lower values for RAM and GPU temperature )
so the fans should most definitely /not/ run at full speed on startup. On the
other hand, since we upgraded to gcc4 starting the Xserver apparently heats
up the CPU quite a bit so the fan speeds up but it should slow down again.
This effect is probably exaggerated on my iBook though, I set the CPU
temperature threshold to 75C.
Ah, wonderful! I wish the x86 BIOS/motherboard folks would initialize
the sensors to sane values! (Maybe I should migrate from amd64 machines
to an iBook?)
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