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Date: Fri, 7 Mar 2014 10:17:18 -0800 From: Guenter Roeck <linux@...ck-us.net> To: Laszlo Papp <lpapp@....org> Cc: Jean Delvare <jdelvare@...e.de>, LKML <linux-kernel@...r.kernel.org>, lm-sensors@...sensors.org Subject: Re: Tachometer speed returned rather than absolute fan speed? On Fri, Mar 07, 2014 at 03:47:08PM +0000, Laszlo Papp wrote: > On Fri, Mar 7, 2014 at 3:37 PM, Jean Delvare <jdelvare@...e.de> wrote: > >> > I'm quite confused. While I admit that the term "tachometer speed" is > >> > awkward, the max6650 driver is reporting fan speeds in RPM as every > >> > other hwmon driver. So I really have no idea what you think is wrong. > >> > What did you think "tachometer speed" was, if not the fan speed? Does > >> > the max6650 driver not return correct fan speeds for you? > > That is some strange behavior. If I do "echo 1 > pwm1_enable; echo 0 > > pwm1; cat fan1_input", I still see 30 for the connected fan, whereas I > can see it stopped. Is this an expected behavior? I would expect zero > as a user. > I seem to recall that I had seen that as well, with no fan connected. Maybe the tachometer registers always read at least '1'. I would think it is wrong, but we'll have to understand the chip a bit better to be able to provide a fix. Unless you already have a fix ready, of course. I'll try to re-test tonight if I find the time. Guenter -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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