From: Michael Zintakis <michael.zintakis@googlemail.com> To: Guenter Roeck <linux@roeck-us.net> Cc: lm-sensors@lm-sensors.org, Len Brown <lenb@kernel.org>, linux-acpi@vger.kernel.org Subject: Re: [lm-sensors] Fintek f71882fg ACPI conflict Date: Thu, 28 Jun 2012 12:31:30 +0100 [thread overview] Message-ID: <4FEC4092.7090104@googlemail.com> (raw) In-Reply-To: <20120628052032.GA16364@roeck-us.net> > Do you mean sysfs ? > Yeah, sorry. Everything under /sys/class/hwmon/... > Correct. 1 is too low, though. Default value per datasheet is 0x80. > Whatever it is, it should be high enough for the fans to start spinning. > That won't be enough! I did a bit of experimenting and discovered the following: The minimum value for pwm on all fans necessary to keep them going is 75 (decimal) - below that value the fan just stops. The minimum value to kick-start the fan and make it spin from standstill is 190 (also decimal) - nothing below this value is sufficient to move the fan from its standstill position (in my script I use the maximum value - 255 - to be on the safe side). So, even if I set the pwmX_auto_point5_pwm to 75 that won't be enough to kick-start the fan initially. On the other hand, if I set it to 190 that would be enough, but the fan will continue to spin at this rate which is very high (I may as well abandon fan/temperature management then). > The F71882FG does not have a register to set a "start spinning" pwm value, > so your minimum must guarantee that the fans do start to spin. > > What is your setting for pwmX_enable ? It should probably be set to > automatic(2) so the chip can automatically control the fan speed depending > on the temperature. > It is indeed set to 2. >> Even if I bring this value to some "idle" current, that won't help >> much because when I first boot the system, the fans are *always* >> still, so even if the idle state is >1, that won't help me much, so >> there must be another - better - way than using a script to >> "kickstart" the fans initially, surely! >> >> > Maybe fan control is not set to automatic by the BIOS ? > It is and it is why I am keeping this automatic BIOS fan management in place and my script only intervenes to kick-start the fans when they are still, otherwise this automatic control is doing a good job. The problem is the actual kick-start (and the fact that there is no way I could force ACPI to abandon the region of memory used by the driver).
WARNING: multiple messages have this Message-ID (diff)
From: Michael Zintakis <michael.zintakis@googlemail.com> To: Guenter Roeck <linux@roeck-us.net> Cc: lm-sensors@lm-sensors.org, Len Brown <lenb@kernel.org>, linux-acpi@vger.kernel.org Subject: Re: [lm-sensors] Fintek f71882fg ACPI conflict Date: Thu, 28 Jun 2012 11:31:30 +0000 [thread overview] Message-ID: <4FEC4092.7090104@googlemail.com> (raw) In-Reply-To: <20120628052032.GA16364@roeck-us.net> > Do you mean sysfs ? > Yeah, sorry. Everything under /sys/class/hwmon/... > Correct. 1 is too low, though. Default value per datasheet is 0x80. > Whatever it is, it should be high enough for the fans to start spinning. > That won't be enough! I did a bit of experimenting and discovered the following: The minimum value for pwm on all fans necessary to keep them going is 75 (decimal) - below that value the fan just stops. The minimum value to kick-start the fan and make it spin from standstill is 190 (also decimal) - nothing below this value is sufficient to move the fan from its standstill position (in my script I use the maximum value - 255 - to be on the safe side). So, even if I set the pwmX_auto_point5_pwm to 75 that won't be enough to kick-start the fan initially. On the other hand, if I set it to 190 that would be enough, but the fan will continue to spin at this rate which is very high (I may as well abandon fan/temperature management then). > The F71882FG does not have a register to set a "start spinning" pwm value, > so your minimum must guarantee that the fans do start to spin. > > What is your setting for pwmX_enable ? It should probably be set to > automatic(2) so the chip can automatically control the fan speed depending > on the temperature. > It is indeed set to 2. >> Even if I bring this value to some "idle" current, that won't help >> much because when I first boot the system, the fans are *always* >> still, so even if the idle state is >1, that won't help me much, so >> there must be another - better - way than using a script to >> "kickstart" the fans initially, surely! >> >> > Maybe fan control is not set to automatic by the BIOS ? > It is and it is why I am keeping this automatic BIOS fan management in place and my script only intervenes to kick-start the fans when they are still, otherwise this automatic control is doing a good job. The problem is the actual kick-start (and the fact that there is no way I could force ACPI to abandon the region of memory used by the driver). _______________________________________________ lm-sensors mailing list lm-sensors@lm-sensors.org http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
next prev parent reply other threads:[~2012-06-28 11:31 UTC|newest] Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-06-26 23:56 [lm-sensors] Fintek f71882fg ACPI conflict Michael Zintakis 2012-06-27 17:15 ` Guenter Roeck 2012-06-27 17:15 ` [lm-sensors] " Guenter Roeck 2012-06-27 23:00 ` Michael Zintakis 2012-06-27 23:00 ` Michael Zintakis 2012-06-28 1:45 ` Matthew Garrett 2012-06-28 1:45 ` Matthew Garrett 2012-06-28 11:15 ` Michael Zintakis 2012-06-28 11:15 ` Michael Zintakis 2012-06-28 12:40 ` Jean Delvare 2012-06-28 12:40 ` Jean Delvare 2012-06-28 12:53 ` Michael Zintakis 2012-06-28 12:53 ` Michael Zintakis 2012-06-28 13:27 ` Jean Delvare 2012-06-28 13:27 ` Jean Delvare 2012-06-29 5:35 ` Robert Hancock 2012-06-29 5:35 ` Robert Hancock 2012-06-29 12:11 ` Michael Zintakis 2012-06-29 12:11 ` Michael Zintakis 2012-06-29 16:34 ` Guenter Roeck 2012-06-29 16:34 ` Guenter Roeck 2012-06-28 5:20 ` Guenter Roeck 2012-06-28 5:20 ` Guenter Roeck 2012-06-28 11:31 ` Michael Zintakis [this message] 2012-06-28 11:31 ` Michael Zintakis 2012-06-28 17:12 ` Guenter Roeck 2012-06-28 17:12 ` Guenter Roeck 2012-06-28 17:39 ` Michael Zintakis 2012-06-28 17:39 ` Michael Zintakis 2012-06-28 18:57 ` Guenter Roeck 2012-06-28 18:57 ` Guenter Roeck 2012-06-28 3:15 ` Andrey Repin 2012-06-28 11:36 ` Michael Zintakis
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