From: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
To: linux-fbdev@vger.kernel.org
Subject: Re: How to use backlight device with fb device
Date: Thu, 15 Sep 2011 08:58:20 +0000 [thread overview]
Message-ID: <4E71BE2C.4020807@gmx.de> (raw)
In-Reply-To: <1316072820.1880.51.camel@deskari>
Hi Tomi,
On 09/15/2011 07:47 AM, Tomi Valkeinen wrote:
> Hi,
>
> I'm a bit confused how a backlight device and a fb device should be
> "connected".
>
> In this particular case the OMAP 4430SDP board has an LCD panel
> controlled by omapfb (and omapdss on the lower level) with a backlight
> controlled by pwm_backlight (and twl6030-pwm on the lower level).
>
> Both omapfb and pwm_backlight work fine, but they don't know anything
> about each other, so, for example, blanking the fb via omapfb leaves the
> backlight on.
>
> Is there something I'm missing, or is the only solution to have some
> custom code to connect the fb and the bl, and handle it that way?
I don't know anything about backlight but recently there was a patch that
affected the same area you mention so it might give an idea
"[PATCH] FB: add early fb blank feature."
http://marc.info/?l=linux-fbdev&m\x131554458720940&w=2
Best regards,
Florian Tobias Schandinat
>
> Tomi
>
>
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next prev parent reply other threads:[~2011-09-15 8:58 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-15 7:47 How to use backlight device with fb device Tomi Valkeinen
2011-09-15 8:58 ` Florian Tobias Schandinat [this message]
2011-09-15 9:18 ` Tomi Valkeinen
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