Re: Using a temperature sensor with 1-bit output for CPU throttling

Javi Merino <[email protected]> Wed, 29 Apr 2015 17:36:05 +0100
Newsgroups org.kernel.vger.cpufreq,org.kernel.vger.linux-pm
Message-ID <20150429163605.GM3054@e104805>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