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

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Message-ID: <20070217181413.GA10134@dreamland.darkstar.lan>
Date:	Sat, 17 Feb 2007 19:14:13 +0100
From:	Luca Tettamanti <kronos@...ple.it>
To:	Giuseppe Bilotta <giuseppe.bilotta@...il.com>
Cc:	James Simmons <jsimmons@...radead.org>,
	linux-fbdev-devel@...ts.sourceforge.net,
	Andrew Morton <akpm@...l.org>, Dave Airlie <airlied@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [Linux-fbdev-devel] [PATCH] nvidiafb: allow ignoring EDID info

Il Tue, Feb 13, 2007 at 10:25:41AM +0100, Giuseppe Bilotta ha scritto: 
> On 2/11/07, Luca Tettamanti <kronos@...ple.it> wrote:
> >Sorry for the delay.
> 
> Ditto!
> 
> It also seemed that my kernel compiling sk1llz had gone AWL, I
> couldn't get the newly compiled kernel to run, until I realized the
> initrd.img was mislinked. Anyway.
> 
> Your patch has an immediately visible effect of reducing snow: it
> seems that now that you fixed the access bug the EDID is properly
> /not/ used. dmesg | grep nvidiafb now claims the following:
> 
> """
> 
> nvidiafb: Device ID: 10de0112
> nvidiafb 0000:01:00.0: Unable to read EDID block.
> nvidiafb 0000:01:00.0: Unable to read EDID block.
> nvidiafb 0000:01:00.0: Unable to read EDID block.
> 
> (it actually gave the "I2C probe failed ..." message on console, but
> it's not appearing in the dmesg, obviously, since it's a simple
> printk)
> 
> nvidiafb 0000:01:00.0: Unable to read EDID block.
> nvidiafb 0000:01:00.0: Unable to read EDID block.
> nvidiafb 0000:01:00.0: Unable to read EDID block.
> nvidiafb: CRTC 1 is currently programmed for DFP
> nvidiafb: Using DFP on CRTC 1
> nvidiafb: Panel size is 1600 x 1200
> nvidiafb: Panel is TMDS
> nvidiafb: MTRR set to ON
> nvidiafb: Flat panel dithering disabled
> nvidiafb: PCI nVidia NV11 framebuffer (32MB @ 0xE0000000)
> 
> """

Ok, now I'm confused O_o
The patch should be correct, but I fail to see how EDID reading succeded
before.

> So the EDID still seems to be totally inaccessible (which means I
> can't really tell why/when/where it's b0rked).
> 
> Finally, as I mentioned, console still has a little snow. It's barely
> perceptible in common console usage because the monitor is mostly
> black, but can get annoying with fullscreen apps à la mc.

Maybe the snow was caused by the driver hammering the I2C bus. Just
guessing...

Can you send me X.org log?

Luca
-- 
Alcuni pensano che io sia una persona orribile, ma non e` vero. Ho il
cuore di un ragazzino - in un vaso sulla scrivania.
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