linux-kernel - Re: [PATCH linux-next V2] tty: Disable default console blanking interval

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Message-ID: <d7ca4c04-eb47-e0b5-7ee7-e69d96857f4d@gmail.com>
Date:   Thu, 23 Mar 2017 08:42:03 -0400
From:   "Austin S. Hemmelgarn" <ahferroin7@...il.com>
To:     Scot Doyle <lkml14@...tdoyle.com>,
        Tim Gardner <tim.gardner@...onical.com>
Cc:     linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Adam Borowski <kilobyte@...band.pl>
Subject: Re: [PATCH linux-next V2] tty: Disable default console blanking
 interval

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.