From mboxrd@z Thu Jan  1 00:00:00 1970
From: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>
Subject: Re: screen goes blank when loading gma500_gfx (atom D2500)
Date: Mon, 10 Feb 2014 10:44:31 +0000
Message-ID: <20140210104431.63f1a754@alan.etchedpixels.co.uk>
References: <52F68BEF.5030305@msgid.tls.msk.ru>
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To: Michael Tokarev <mjt@tls.msk.ru>
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> fbcon is loaded so it isn't an issue.
> 
> I tried 3.10 kernel initially (the above messages are from it), next
> I tried 3.13 kernel too, and that one behaves exactly the same.
> 
> As far as I remember, this system never worked with graphics well.
> Previous kernel (from which I updated) was 3.2 which had no
> gma500 module (local build).
> 
> What are the steps to debug this further?

Check you have X86_SYSFB and SIMPLEFB disabled

Boot with drm.debug=6

collect the logs