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Re: dbcool on iBook G4 late 2004 doesn't work
On Oct 11, 2008, at 11:45 AM, Paul Goyette wrote:
On Sat, 11 Oct 2008, Robert Fritzsche wrote:
I tried the new 4.99.73 kernel on my iBook G4 late 2004 with dbcool
in the kernel config. After reboot the fan run with full
revolutions and envstat doesn't notice the new sensor.
Can anyone help me?
Well, I wrote the thing, so maybe I can help!
Did you ever have any sensors detected using an earlier kernel?
Which one(s)? Do you have a dmesg from both the older and current
kernel so we can compare?
I don't have any macppc hardware to play with, so I converted the
'dbcool at ki2c' blindly. I expected it to work, but you never know!
dbcool at iic addr whatever will probably Just Work(tm) now that the
driver actually looks for the chip instead of blindly relying on
config like my old driver did ( that was the main purpose of the ki2c
attachment - not having to provide an address and not having to look
for the chip )
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
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
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