> > Care to test again? It should be better. > > Ok, doing better now. Output attached. Great :) > Found the following PWM controls: > 1-0290/fan1_pwm > 1-0290/fan2_pwm > 1-0290/fan3_pwm > > Found the following fan sensors: > 1-0290/fan1_input current speed: 0 ... skipping! > 1-0290/fan2_input current speed: 2667 RPM > 1-0290/fan3_input current speed: 0 ... skipping! OK, so at least it finds the files. This is what the change was all about. > Testing pwm control 1-0290/fan1_pwm ... > 1-0290/fan2_input ... speed was 2667 now 2700 > no correlation > > Testing pwm control 1-0290/fan2_pwm ... > 1-0290/fan2_input ... speed was 2667 now 0 > It appears that fan 1-0290/fan2_input > is controlled by pwm 1-0290/fan2_pwm > Would you like to generate a detailed correlation (y)? > Would you like to generate a graphical plot using gnuplot (y)? > PWM 255 FAN 2689 > PWM 240 FAN 2689 > PWM 225 FAN 0 > Fan Stopped at PWM = 225 > Hit return to continue... > > Testing pwm control 1-0290/fan3_pwm ... > 1-0290/fan2_input ... speed was 2667 now 2667 > no correlation > > The problem is fan2_pwm, where only 3 samples are taken. This is not > enough in this case. Most likely because you have a low fan divisor. Try increasing it and try again. You need a high divisor to be able to measure low speed fans, and lowering PWM lowers fan speed. Maybe the script could take care of this? > Bug in script: > Line 242: > if [ "$S" = "0" -o "S" = "-1" ] > Shouldn't "S" be "$S" ? Correct, nice catching. I've fixed it, thanks. > Problems: > - at pwm 240, the fan speed reported in 0 while I still hear it > turning. Same reason: fan divisor must be too low. > - at pwm 200, is goes even faster than at 255, and it > reports 3139 as rpm(!). Admittedly strange. Possibly some emergency mode of the chip. I don't know about the W83627HF, but I know similar chips with that functionality. On alert conditions (overtemperature...) manual PWM is disabled and fans are forced to full speed. > It appears the speed is also depending on the speed from which it > came. Doing > echo 255 >fan2_pwm; sleep 2; echo 200 >fan2_pwm > will give me +-3100, while doing > echo 0 >fan2_pwm; sleep 2; echo 200 >fan2_pwm > will give me 0. Strange... No wonder to me. Fans have inertia, it's natural that the "original" speeds has an influence. > Where do I report such strange interaction? Doesn't sound that strange to me. That said, I think that Marius is the most qualified of us all with PWM issues, so he's the one you want to address your questions to, if there's really a problem. Thanks. -- Jean Delvare http://khali.linux-fr.org/
