linux-kernel - Re: [V3 PATCH 1/2] drivers-gpu-drm-allow-to-load-edid-firmware.patch

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Message-ID: <CAE2SPAaz4oa7q4UTZ=iiKGv3v8=6xT_=odgMN-mrH9enRP26qQ@mail.gmail.com>
Date:	Thu, 15 Mar 2012 11:30:36 +0100
From:	Bastien ROUCARIES <roucaries.bastien@...il.com>
To:	Carsten Emde <C.Emde@...dl.org>
Cc:	David Airlie <airlied@...ux.ie>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Valdis Kletnieks <Valdis.Kletnieks@...edu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Keith Packard <keithp@...thp.com>,
	Paul Menzel <paulepanter@...rs.sourceforge.net>,
	DRI <dri-devel@...ts.freedesktop.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [V3 PATCH 1/2] drivers-gpu-drm-allow-to-load-edid-firmware.patch

On Thu, Mar 15, 2012 at 10:52 AM, Carsten Emde <C.Emde@...dl.org> wrote:
> Broken monitors and/or broken graphic boards may send erroneous or no
> EDID data. This also applies to broken KVM devices that are unable to
> correctly forward the EDID data of the connected monitor but invent
> their own fantasy data.
>
> This patch allows to specify an EDID data set to be used instead of
> probing the monitor for it. It contains built-in data sets of frequently
> used screen resolutions. In addition, a particular EDID data set may be
> provided in the /lib/firmware directory and loaded via the firmware
> interface. The name is passed to the kernel as module parameter of the
> drm_kms_helper module either when loaded
>  options drm_kms_helper edid_firmware=edid/1280x1024.bin
> or as kernel commandline parameter
>  drm_kms_helper.edid_firmware=edid/1280x1024.bin

Windows allow vendor to override eddid based on 3 bytes manufacturer
and product code.

Seems a reasonnable approach to follow.

Bastien
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