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Date: Thu, 14 Nov 2013 13:52:09 +0000
From: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>
To: Andreas Werner <wernerandy@gmx.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Black screen with GMA500 driver on Atom E680 (invalid VBT
 signature)
Message-ID: <20131114135209.0a8a15ff@alan.etchedpixels.co.uk>
In-Reply-To: <20131113183418.GA1593@thinkpad.fritz.box>
References: <20131113183418.GA1593@thinkpad.fritz.box>
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> My question now is, is it a bug in the driver or in the VGA Bios?
> 
> I´ve checked the VGA bios and did a hex dump but there is really no "$VBT" string.
> On an Atom Gen1 CPU with intel GMA500 Graphic there is the string in the VGA BIOS.
> But if i create the VGA BIOS for intel Atom E680 which has a GMA600 Graphic
> there is no string.
> 
> Does anybody of you running the GMA500 driver with and Atom E680 without having this
> problem? Or does anybody know how to get this string into the VGA BIOS?

E680 I believe will try and use the other style of parsing. I never got
my hands on one to confirm that but in general E6xx seems to use
Moorestown style tables instead and you'll only get support for some
outputs.