linux-kernel - Re: [Linux-fbdev-devel] [PATCH] nvidiafb: allow ignoring EDID info

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Message-ID: <21d7e9970701281612q56b694edp6efd1a5556dea3fe@mail.gmail.com>
Date:	Mon, 29 Jan 2007 11:12:57 +1100
From:	"Dave Airlie" <airlied@...il.com>
To:	linux-fbdev-devel@...ts.sourceforge.net
Cc:	"Giuseppe Bilotta" <giuseppe.bilotta@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [Linux-fbdev-devel] [PATCH] nvidiafb: allow ignoring EDID info

> > Some nVidia video cards have broken EDID information. Using nvidiafb
> > with CONFIG_FB_NVIDIA_I2C enabled on these systems causes the console
> > framebuffer to use wrong timing information, causing the display to be
> > extremely 'snowy'. Since most distribution kernels are compiled with
> > CONFIG_FB_NVIDIA_I2C enabled, this prevents usage of the nvidia
> > framebuffer on said broken system without recompiling the kernel
> > (or at least the nvidiafb module).
> >
> > Solve the issue by introducing a new boolean module parameter (useedid)
> > which can be set to 0 to prevent the driver from using the EDID
> > information.
> >
> > If this patch is accepted, we can probably get rid of CONFIG_FB_NVIDIA_I2C
> > altogether.
> >
>
> That's a pretty sad solution.  Is it possible to detect these bad cards at
> runtime via ther behaviour?  If not, can we generate a blacklist for the
> known-bad cards based on PCI IDs or something?
>
> Because most users won't even be aware of the module option: they'll just
> know that their card doesn't work right.

This isn't a card problem this is a monitor problem, the card just
passes through the edid data from the monitor... or else the
programming of the card registers from edid is wrong..

Dave.
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