Hi Andrew, On Tue, 14 Sep 2010 09:52:12 +0100, Andrew Lyon wrote: > I have a system with Supermicro X7DWA-N motherboard, according to the > manual it has "Winbond W83627HF w/Hardware Monitor support: W83793" so > I've loaded both the w83627hf and w83793 modules and several sensors > and fans are detected, however when I try to control fan speed I find > that the only pwm output which has any effect is pwm3 and it seems to > control all of the fans at once, also pwm1 is locked at 112: What's the value of pwm1_enable? Could be that this PWM output is not currently in manual control mode. Which kernel are you running? The w83793 driver is still marked experimental, there could be a bug in it. > > ubermicro 0-002f # pwd > /sys/devices/pci0000:00/0000:00:1f.3/i2c-0/0-002f > ubermicro 0-002f # lspci | grep 1f.3 > 00:1f.3 SMBus: Intel Corporation 631xESB/632xESB/3100 Chipset SMBus > Controller (rev 09) > ubermicro 0-002f # ls pwm? > pwm1 pwm2 pwm3 pwm4 pwm5 pwm6 pwm7 pwm8 > ubermicro 0-002f # cat pwm? > 112 > 0 > 160 > 0 > 0 > 0 > 0 > 0 > > > ubermicro 0-002f # echo 0 >pwm3 > ubermicro 0-002f # sensors | grep fan > fan1: 1564 RPM (min = 712 RPM) > fan2: 1652 RPM (min = 712 RPM) > fan3: 1636 RPM (min = 712 RPM) > fan4: 1638 RPM (min = 712 RPM) > fan6: 2351 RPM (min = 712 RPM) > fan7: 1622 RPM (min = 712 RPM) > fan8: 1605 RPM (min = 712 RPM) > > ubermicro 0-002f # echo 140 >pwm3 > ubermicro 0-002f # sensors | grep fan > fan1: 1973 RPM (min = 712 RPM) > fan2: 2089 RPM (min = 712 RPM) > fan3: 2064 RPM (min = 712 RPM) > fan4: 2051 RPM (min = 712 RPM) > fan6: 2755 RPM (min = 712 RPM) > fan7: 2048 RPM (min = 712 RPM) > fan8: 2002 RPM (min = 712 RPM) > > > Is it possible to gain control of the fans individually? Very unlikely. PWM signal routing to fans is a hardware thing, it's been decided by your motherboard vendor and you have to live with it. Here I have an Asus server board with 8 fan inputs, 2 PWM output controls, one controls the 2 CPU fans, and the other one controls the 6 case fans. So it's similar to your board, only slightly better because CPU fans have their own control. It is possible (but again unlikely) that the hardware vendor implemented a user-controllable PWM routing. In that case it would certainly be advertised by said vendor, and exposed in the BIOS or by some custom tool. But I don't think I've ever seen this in practice. And I don't think it would make too much sense (it would be cheaper to route PWM outputs individually and group them at the software level if needed.) -- Jean Delvare http://khali.linux-fr.org/wishlist.html _______________________________________________ lm-sensors mailing list lm-sensors@xxxxxxxxxxxxxx http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
