Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754849AbdCWMmI (ORCPT ); Thu, 23 Mar 2017 08:42:08 -0400 Received: from mail-it0-f66.google.com ([209.85.214.66]:36328 "EHLO mail-it0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751159AbdCWMmG (ORCPT ); Thu, 23 Mar 2017 08:42:06 -0400 Subject: Re: [PATCH linux-next V2] tty: Disable default console blanking interval To: Scot Doyle , Tim Gardner References: <1490190632-10464-1-git-send-email-tim.gardner@canonical.com> <1490195240-16372-1-git-send-email-tim.gardner@canonical.com> Cc: linux-kernel@vger.kernel.org, Greg Kroah-Hartman , Jiri Slaby , Adam Borowski From: "Austin S. Hemmelgarn" Message-ID: Date: Thu, 23 Mar 2017 08:42:03 -0400 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 865 Lines: 18 On 2017-03-22 21:32, Scot Doyle wrote: > On Wed, 22 Mar 2017, Tim Gardner wrote: >> BugLink: http://bugs.launchpad.net/bugs/869017 >> >> Console blanking is not enabling DPMS power saving (thereby negating any >> power-saving benefit), and is simply turning the screen content blank. This >> means that any crash output is invisible which is unhelpful on a server >> (virtual or otherwise). >> >> Furthermore, CRT burn in concerns should no longer govern the default case. >> Affected users could always set consoleblank on the kernel command line. > > Does screen blanking save some power by disabling the cursor blink? > Unless you're dealing with ancient hardware, the difference in power usage is probably on the order of single digit micro-watts, which is not worth worrying about on almost anything you would expect to have a console display connected to.