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

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On Wed, Mar 22, 2017 at 07:50:32AM -0600, Tim Gardner wrote:
> BugLink: http://bugs.launchpad.net/bugs/869017
> 
> I'm not particularly knowledgable about console issues. Is a blaknking interval
> relevant in a post CRT world ? The argument in the bug description seems
> compelling.

I have no direct knowledge about screen burn-in, but a quick search shows
that, while not as prevalent as in the CRT days, it's still an issue:
https://en.wikipedia.org/wiki/Screen_burn-in
https://encrypted.google.com/search?hl=en&q=lcd%20screen%20burn-in

> -static int blankinterval = 10*60;
> +static int blankinterval;

Thus, the current default might be safer: an even all-black image will keep
the display readable as there won't be any localized artefacts.  On the
other hand, the photos I see are nowhere as bad as it was the case on CRTs,
so this reason might be dismissed.


There is another concern, though: light pollution.  A white image makes the
room bright enough to read by.  Don't laugh but 20 years ago in the dorm I
used to print \e[37;47;1m then 2000 'X'es to the screen to do things[1] (the
overhead light would wake up the roommates).  That was a CRT, LCDs are
brighter.  Obviously, lightgrey text on a black background producess less
light than all-white, but a regular monitor probably still gives off a total
amount of light similar to that of an all-white smartphone.

I'm not sure how many non-X screens are placed in rooms where someone tries
to sleep, but it's not something to ignore entirely.


I'm not arguing a hard "no", but you should at least think of the above two
concerns.


[1]. Not reading obviously, I am not _that_ insane. :þ
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[PATCH linux-next] tty: Disable default console blanking interval Tim Gardner <tim.gardner@canonical.com> - 2017-03-22 15:00 +0100
  Re: [PATCH linux-next] tty: Disable default console blanking interval "Austin S. Hemmelgarn" <ahferroin7@gmail.com> - 2017-03-22 15:20 +0100
  Re: [PATCH linux-next] tty: Disable default console blanking interval Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-22 16:00 +0100
  [PATCH linux-next V2] tty: Disable default console blanking interval Tim Gardner <tim.gardner@canonical.com> - 2017-03-22 16:10 +0100
    Re: [PATCH linux-next V2] tty: Disable default console blanking  interval Scot Doyle <lkml14@scotdoyle.com> - 2017-03-23 02:40 +0100
      Re: [PATCH linux-next V2] tty: Disable default console blanking  interval "Austin S. Hemmelgarn" <ahferroin7@gmail.com> - 2017-03-23 13:50 +0100
        Re: [PATCH linux-next V2] tty: Disable default console blanking  interval Scot Doyle <lkml14@scotdoyle.com> - 2017-03-24 03:30 +0100
  Re: [PATCH linux-next] tty: Disable default console blanking interval Adam Borowski <kilobyte@angband.pl> - 2017-03-23 03:10 +0100

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