From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Rafael J. Wysocki" Subject: Re: intel-pstate driver not clocking down on Atom Z8750 Date: Sun, 25 Jun 2017 23:24:55 +0200 Message-ID: <13898444.q12oX9ZNe5@aspire.rjw.lan> References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7Bit Return-path: Received: from cloudserver094114.home.net.pl ([79.96.170.134]:58538 "EHLO cloudserver094114.home.net.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751343AbdFYVcT (ORCPT ); Sun, 25 Jun 2017 17:32:19 -0400 In-Reply-To: Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: Christopher Williamson Cc: srinivas.pandruvada@linux.intel.com, lenb@kernel.org, viresh.kumar@linaro.org, linux-pm@vger.kernel.org, Hans de Goede On Sunday, June 25, 2017 03:39:11 PM Christopher Williamson wrote: > Hi there, > > I've just purchased a device called a "GPD Pocket" (more info at > indiegogo.com/projects/gpd-pocket-7-0-umpc-laptop-ubuntu-or-win-10-os-laptop--2/x/7959405) > but in short - one of the major problems I have with the device is that the > included Intel Atom Z8750 never clocks below the turbo boost speed meaning > it overheats very quickly and crashes. > > I have managed to avoid this behaviour in two ways: > > 1.) Disable turbo boost - the device then sits firmly at 1.6GHz and refuses > to clock below that. > > 2.) Disable the intel_pstate driver and the CPU then clocks properly but > cannot turbo boost at all so I lose that capability. > > I'm really just reaching out to you fine folks to find out where best to > discuss this issue. I'm happy to raise a kernel bug report if that helps > and also happy to provide command outputs as needed. > > I have included Hans de Goede in the CC list on this email since he has > been a great help getting to this point - this device has a few strange > quirks to work through but this is a fairly serious one. What kernel versions have you tried? Thanks, Rafael