From: Pavel Machek <pavel@suse.cz>
To: Andreas Mohr <andi@rhlx01.fht-esslingen.de>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] 2.5.70: add comment about console LCD backlight issues
Date: Thu, 5 Jun 2003 00:03:56 +0200 [thread overview]
Message-ID: <20030604220356.GK333@elf.ucw.cz> (raw)
In-Reply-To: <20030529122816.GB21147@rhlx01.fht-esslingen.de>
Hi!
> a lot of people seem to be confused about (non-working) notebook display
> blanking, so...
>
> - add verbose explanation about the whole notebook screen blanking situation
> and a possible development direction to prominent place
Please submit it to Rusty trivial patch monkey Russell
<trivial@rustcorp.com.au>.
> I might actually be tempted to unify graphics hardware backlight handling
> myself, since having a console that doesn't shut down the backlight properly
> is mildly annoying...
Yep, solving that somehow would be good.
> Patch against vanilla 2.5.70.
>
> Andreas Mohr
>
> diff -urN linux-2.5.70.orig/drivers/video/console/vgacon.c linux-2.5.70/drivers/video/console/vgacon.c
> --- linux-2.5.70.orig/drivers/video/console/vgacon.c 2003-05-28 17:57:07.000000000 +0200
> +++ linux-2.5.70/drivers/video/console/vgacon.c 2003-05-29 03:13:53.000000000 +0200
> @@ -661,6 +661,22 @@
> }
> }
>
> +/*
> + * vgacon_blank() is able to simply blank the screen, or to even switch
> + * the monitor off in case of "Green", "Energy Star" monitors
> + * (by switching off the sync signals using VESA mechanisms).
> + * However, it is NOT able to switch off the *backlight* of (most?)
> notebooks.
Acurate, AFAICS. Why can't that stupid notebook manufacturers make it
turn backlight off on VESA blank?!
Pavel
--
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]
prev parent reply other threads:[~2003-06-04 21:51 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-29 12:28 Andreas Mohr
2003-06-04 22:03 ` Pavel Machek [this message]
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