Hi Phil, On 6/2/07, Phil Endecott <spam_from_lm_sensors at chezphil.org> wrote: > Dear All, > > I have a Jetway J7F2 motherboard; it's a mini-ITX board with a VIA C7 > processor and the Fintec f71805f sensor chip. > > Temperature and fan speed measurements work correctly, and most of the > voltages look right to me. I have no idea whether the values for > Vtt1.2V, Vram, Vchip and Vcc1.5V are right: > > # sensors > f71805f-isa-0290 > Adapter: ISA adapter > +3.3V: +3.42 V (min = +3.01 V, max = +3.58 V) > Vtt1.2V: +0.86 V (min = +0.00 V, max = +2.02 V) > Vram: +1.46 V (min = +0.00 V, max = +4.03 V) > Vchip: +3.58 V (min = +0.00 V, max = +6.31 V) > +5V: +5.13 V (min = +0.00 V, max = +10.59 V) > +12V: +12.32 V (min = +0.00 V, max = +22.18 V) > Vcc1.5V: +1.11 V (min = +0.00 V, max = +2.02 V) > Vcore: +1.09 V (min = +0.00 V, max = +2.02 V) > 5VSB: +5.13 V (min = +0.00 V, max = +10.59 V) > CPU Fan: 0 RPM (min = 0 RPM) > Sys Fan: 0 RPM (min = 0 RPM) > Aux Fan: 4559 RPM (min = 0 RPM) > CPU Temp: +22?C (high = +70?C, hyst = +69?C) [diode] > Sys Temp: +31?C (high = +255?C, hyst = +0?C) [diode] > Aux Temp: +115?C (high = +255?C, hyst = +0?C) [thermistor] > > (err, well some of those numbers look a bit odd but that's just because > I have been messing around.) > > Unfortunately, PWM fan speed control doesn't seem to work. I can write > things to the pwm /sys devices, but nothing happens. For example, I > have asked for them all to be off: > > localhost:/sys/devices/platform/f71805f.656# for i in pwm*; do echo -n > $i ': '; cat $i; done > pwm1 : 0 > pwm1_enable : 1 > pwm1_freq : 187500 > pwm1_mode : 1 > pwm2 : 0 > pwm2_enable : 1 > pwm2_freq : 187500 > pwm2_mode : 1 > pwm3 : 0 > pwm3_enable : 1 > pwm3_freq : 187500 > pwm3_mode : 1 > > (I hope I have understood this correctly; 'enable=1' means manual > control, and 'pwm=0' means off, right?) > > But I still see 12V on all of the fan connectors and they run at full speed. > > So the possibilities are: > - I'm doing something wrong (very likely, I'm new to this). > - The lm-sensors code is doing something wrong. > - My board doesn't actually have PWM control on these outputs and > they're hard-wired to 12V. > > Right now I think that the last of those is quite likely; I can't > exactly trace the 12V from the power input all the way to the fan > connectors, but I can see where it goes for much of the distance and I > don't see any power transistors. If you have an Ohmmeter, you can measure the resistance between the fan connector pins and 12V & ground. If both readings are 0 you're out of luck, i.e., the fan is hardwired to 12V/ground. > So, has anyone else had any experience with this board? Has PWM been > known to work with other boards with this chip? Is it common for fan > connectors to not have PWM control? I can't speak for your board but the same applies to my EPIA M10000. No PWM control, stupid design. > Finally, somewhat O.T., if it seems that I can't control the fan speed > on this board, can anyone suggest a "hardware hack"? In the past I > have built fan speed controllers with thermisters and op-amps, but > something with software control would be better. That's fairly simple, typically a transistor between the fan and ground, controlled by the PWM controller. The hard part is to get to the components, especially on a Mini ITX board. You might have to solder wires to pins and lift pins and fun stuff like that. Alternatively, you could use a i2c PWM controller (that is of course supported by lm-sensors) and hook it up to the boards I2C bus, Mini ITX typically have it exposed on a header. Google it. ...juerg > > Many thanks in advance for any suggestions. > > > Phil. > > > > > > > _______________________________________________ > lm-sensors mailing list > lm-sensors at lm-sensors.org > http://lists.lm-sensors.org/mailman/listinfo/lm-sensors >
