linux-kernel - 3.8: gma500_gfx black screen on LVDS with Intel DN2800MT

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Date:	Mon, 6 May 2013 11:22:12 +0200
From:	Ivan Stojić <ivans@...econ.com>
To:	linux-kernel@...r.kernel.org
Subject: 3.8: gma500_gfx black screen on LVDS with Intel DN2800MT

Hello!

I've been trying to get gma500_gfx running on Intel's DN2800MT motherboard for an embedded application. The gma500_gfx driver works correctly and without issues when I connect an external monitor on the VGA port, however, if I try connecting it to LVDS display instead, the screen goes black after loading the module. The system works in other aspects (ie I can ssh into the machine and work on it, but I can't get anything on the screen).

Attached are the lspci -vv output and dmesg output after appending drm.debug=0xe to the kernel command line.

I read several mailing list archives, but I wasn't able to find anything similar to this bug that's current - all mentions of similar behaviour are reported to be fixed in >= 3.6.

What's my best course of action here?

Thanks,
-i

Download attachment "lspci-vv.txt" of type "application/octet-stream" (14619 bytes)

Download attachment "dmesg.txt" of type "application/octet-stream" (81158 bytes)