I'm quite surprised that changing the PWM clock worked, at least sortof... (it only slowed the fan down 15% max even after the fix) But 125 kHz is a bad default (and my math and datasheet show a default of 24 MHz / 256 = 93.75 kHz... Khali where did you get 125 kHz?) A typical PWM requirement for a fan is 20 - 50 kHz. It may be worth enhancing the driver to set the speed lower if the BIOS doesn't. Jean Delvare wrote: >>Here the pwmconfig output: >> >>Testing pwm control 1-0290/fan1_pwm ... >> 1-0290/fan1_input ... speed was 2777 now 0 >> It appears that fan 1-0290/fan1_input >> is controlled by pwm 1-0290/fan1_pwm >>Would you like to generate a detailed correlation (y)? >> PWM 255 FAN 3245 >> PWM 240 FAN 3245 >> PWM 225 FAN 3214 >> PWM 210 FAN 3199 >> PWM 195 FAN 3183 >> PWM 180 FAN 3154 >> PWM 165 FAN 3139 >> PWM 150 FAN 3110 >> PWM 135 FAN 3082 >> PWM 120 FAN 3082 >> PWM 105 FAN 3040 >> PWM 90 FAN 3013 >> PWM 75 FAN 2960 >> PWM 60 FAN 2922 >> PWM 45 FAN 2824 >> PWM 30 FAN 2755 >> PWM 15 FAN 0 >> Fan Stopped at PWM = 15 > > > Wow. Glad it work, I didn't really expected it to. Are you using some > unconventional fan? You might want to try different clock values, since > the speed curve is still not perfect. > > >>What would be the "nicest" way of setting these values? I would >>suggest putting it into /etc/modules.conf: >> >>post-install w83627hf /usr/sbin/isaset -y 0x295 0x296 0 25 > /dev/null >> 2> /dev/null >> >>Ok? Or is there a better/safer way? > > > The driver doesn't need to be loaded for it to work (and actually it > would probably be better to run isaset before it is) so I would do a > pre-install. Alternatively you can run the command from any init script, > it doesn't really matter. > > In cas you need it, the register for PWM 2 is 0x02 and works exactly the > same. > > I'll update and close ticket #1384 now. > > >>Thanks a lot. Cheers, > > > You're welcome :) >
