From mboxrd@z Thu Jan 1 00:00:00 1970 From: Guenter Roeck Date: Sat, 14 Feb 2015 14:37:16 +0000 Subject: Re: [lm-sensors] hwmon strangeness, no fan control on w83627dhg Message-Id: <54DF5D9C.1030203@roeck-us.net> List-Id: References: <20150108202919.GA25118@amd> In-Reply-To: <20150108202919.GA25118@amd> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: lm-sensors@vger.kernel.org On 02/14/2015 02:56 AM, Pavel Machek wrote: > Hi! > >>> I don't have much time to spend on this right now but you should start >>> by comparing the datasheets of the W83627DHG and the W83627DHG-P >>> looking for differences. >> >> I got the datasheets, (-P version is novuton, the other one is >> winbond), and there are pretty similar. >> >> The hardware monitoring chapter is pretty similar. Section 5 (PECI) is >> completely rewritten. Section 6.3 has some differences, it looks -P >> has new smart fan III+ feature. Section 6.3.4 (smart fan III+) is >> new. There are differences in 7.1.3.1. section, but that is some SMI >> interrupt stuff, not interesting for us. >> >> Chapter 8/9 (hardware monitor register set) has completely different >> graphics... but seems to describe same hardware. Hmm, it has even the >> same value (5CA3) in the identification register. Sections .70-.84 seems to >> describe new registers for smart fan III+ mode and more. And there are >> more new registers near section .98 and .119. >> >> But it seems hardware should be backwards-compatible... > > Ok, it seems it is. But by default it starts in (non-compatible) smart > fan III+ mode. I can do port(0x15e) &= ~0x20 to kick it back into > compatible mode, and I can then control CPU fan speed in 800..1700 RPM > range as expected; but my goal was to stop the fan to make the machine > quiet... No success with that so far. > Not all CPU fans can be stopped. Maybe that is the case here ? Guenter _______________________________________________ lm-sensors mailing list lm-sensors@lm-sensors.org http://lists.lm-sensors.org/mailman/listinfo/lm-sensors