Tobias, On Thu, 7 Dec 2006 14:10:47 +0100, Tobias Fritz wrote: > Cool, this helps! If I set it to e.g. 3MHz it seems to change pretty smoothly > over the whole range. I have to test this a little more but I don't know when > I'll find time for it. Great. So I created a patch which will let the user change the PWM frequency through a device sysfs file. The patch is against 2.6.18 as this is what the machine I had for testing was running. The it87 driver was significantly modified since then so this patch will need to be rewritten for 2.6.20, I'll do that later. If you give a try to this patch, note that the frequency you control through pwm1_freq is the real PWM base frequency, while the values I gave you before were internal frequencies, which are 128 times greater. In other words, if "3 MHz" was working for you, you'll need to write 23437 (3000000/128) to pwm1_freq. > If I find a value that suits me, how can I set this permanently? You can't, as the IT8705F chip will lose its settings on power-off and most probably on reboot as well. So you'll have to make sure the frequency is set again at boot time. Without the patch, this can be done by calling isaset with the right parameters in one of your system boot scripts. With the patch, echo the wanted frequency to /sys/devices/platform/i2c-9191/9191-0290/pwm1_freq instead (make sure the script is called after the it87 driver is loaded.) -- Jean Delvare -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: hwmon-it87-pwm-freq.patch Url: http://lists.lm-sensors.org/pipermail/lm-sensors/attachments/20061208/b2353c17/attachment.pl
