linux-kernel - Re: [PATCH 2/3] drivers-gpu-drm-add-disable-enable-connector.patch

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Date:	Sun, 11 Mar 2012 21:46:11 +0100
From:	Carsten Emde <C.Emde@...dl.org>
To:	Dave Airlie <airlied@...il.com>
CC:	David Airlie <airlied@...ux.ie>,
	Thomas Gleixner <tglx@...utronix.de>,
	DRI <dri-devel@...ts.freedesktop.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] drivers-gpu-drm-add-disable-enable-connector.patch

On 03/11/2012 08:20 AM, Dave Airlie wrote:
> On Sat, Mar 10, 2012 at 8:20 PM, Carsten Emde<C.Emde@...dl.org>  wrote:
>> Some recent integrated graphics chipset, notably Intel's "Pineview", also
>> provide on-chip LVDS support. As an extra service, the LVDS interface supplies
>> EDID data - irrespective of whether an LVDS panel is connected or not. The
>> drm_mode_getresources() function, therefore, causes Xorg to always include
>> the LVDS panel into the display and initialize a separate screen for it. e.g.
>> (II) intel(0): Output LVDS1 connected
>> (II) intel(0): Output VGA1 connected
>> (II) intel(0): Using spanning desktop for initial modes
>> (II) intel(0): Output LVDS1 using initial mode 1024x768 +0+0
>> (II) intel(0): Output VGA1 using initial mode 1280x1024 +1024+0
>> which is not what you want, if the only connected screen is a VGA monitor.
>> One would assume that the BIOS settings of such systems would allow to
>> separately enable or disable LVDS support; unfortunately, systems have been
>> found in the wild that do not provide this feature.
>
> So video=LVDS-1:d doesn't work for you?
Oops, yes, you are totally right. By some reason, I overlooked this 
option. I tried two systems that need forced disabling and enabling with
   video=LVDS-1:d video=VGA-1:e
which worked perfectly well.

So please skip this patch, sorry for the noise.

Thanks,
	-Carsten.
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