Date: Sat, 21 Oct 2017 14:15:36 +0100 From: tech-lists <tech-lists@zyxst.net> To: freebsd-mobile@freebsd.org, freebsd-hardware@freebsd.org Subject: Re: problems getting AMD C-70 APU working with powerd/cpufreq Message-ID: <20171021131535.GA2771@acer> In-Reply-To: <20171018114241.GA991@desktop.parsley.growveg.org> References: <20171013123721.GA27736@acer.zyxst.net> <20171014215317.K34192@sola.nimnet.asn.au> <20171014212602.GB92751@acer.zyxst.net> <20171016013155.I34192@sola.nimnet.asn.au> <20171016121735.GA73795@acer.zyxst.net> <b11ac2c5-eb75-363a-33b2-6580ed05e79f@yahoo.com> <20171018114241.GA991@desktop.parsley.growveg.org>
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On Wed, Oct 18, 2017 at 12:42:42PM +0100, tech-lists wrote: >On Tue, Oct 17, 2017 at 06:23:06PM -0400, Anthony Jenkins wrote: >>cpufreq(4) does not support AMD processor family 0x14 (20), which I >>believe your dmesg showed your processor to be. > >aha! > >>I had added support for controlling the frequency on some later AMD >>families last year, but the AMD documentation for the 0x14 family is >>pretty complicated for my tiny brain. The other families control >>processor frequency with a single register, but AFACT you use P-states >>on family 0x14. You can have up to 8 P-states, each of which specifies >>a power/frequency configuration. If someone could point me to a >>reference for controlling the frequency for this family, I could submit >>something for review...no idea what Linux does for this family. > >Would it help if I were to get hardware output from booting temporarily >to linux mint? [thought I'd try it anyway] Linux info here: https://www.zyxst.net/txt/amd-c70-netbook/linux-dmesg-amdc70.txt https://www.zyxst.net/txt/amd-c70-netbook/linux-cpufreq-info-amdc70.txt cpufreq appears to be working on linux. Because of this and that brightness control works, I've installed linux mint permanently. If you need me to, I can easily boot into freebsd to run tests; equally can run tests from linux. I'd prefer to run freebsd, but the inability to turn down screen brightness was a showstopper. many thanks, -- J.
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