From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Rafael J. Wysocki" Subject: Re: Touchscreen failure with CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND Date: Fri, 21 Apr 2017 23:28:50 +0200 Message-ID: <1998934.0RuxqCUAOW@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]:54923 "EHLO cloudserver094114.home.net.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1162575AbdDUVe6 (ORCPT ); Fri, 21 Apr 2017 17:34:58 -0400 In-Reply-To: Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: Fabio Estevam Cc: viresh kumar , Sascha Hauer , Shawn Guo , "linux-pm@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" On Friday, April 21, 2017 01:11:52 PM Fabio Estevam wrote: > Hi, > > Running 4.11-rc7 on a imx6q-sabresd board I notice that egalax > touchscreen stops generating evtest events after a random period of > time. > > This problem can be avoided if I unselect CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND: > > --- a/arch/arm/configs/imx_v6_v7_defconfig > +++ b/arch/arm/configs/imx_v6_v7_defconfig > @@ -54,7 +54,6 @@ CONFIG_CMA=y > CONFIG_CMDLINE="noinitrd console=ttymxc0,115200" > CONFIG_KEXEC=y > CONFIG_CPU_FREQ=y > -CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y > CONFIG_ARM_IMX6Q_CPUFREQ=y > CONFIG_CPU_IDLE=y > CONFIG_VFP=y > > With this change evtest always capture all touchscreen events. No > single failure is seen. > > I could see the same behavior with all mainline kernels I tested (4.9 and 4.10). > > Any ideas as to how fix this bug when CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y? And which governor is the default otherwise? Thanks, Rafael