[Intel-gfx] [HSW issue] Can not turn on LVDS panel with kernel 3.8-rc2 on some ivybridge NB

[Jani Nikula]

On Mon, 14 Jan 2013, lawsonlu <lawsonlu at linpus.com> wrote:
> Hi,
>
> I use kernel 3.8-rc2 with haswell support in currently linux os, but the kernel will cause black screen on LVDS panel, and the eDP panel is right.
> Another word, the haswell patch in kernel 3.8 can not turn on LVDS panel on some sample. Can anybody help me for this issue?
> The test platform hardware spec as the following table.

Hi Lawson, Haswell support shouldn't make a difference if you're running
Ivy Bridge. Do you have two different machines, one with eDP and one
with LVDS, or what is your setup?

Just a shot in the dark, please try cherry-picking

commit f30d26e468322b50d5e376bec40658683aff8ece
Author: Jani Nikula <jani.nikula at intel.com>
Date:   Wed Jan 16 10:53:40 2013 +0200

    drm/i915/eDP: do not write power sequence registers for ghost eDP

from [1]; that fixes a ghost eDP screwing up LVDS. If that doesn't work,
please file a bug on DRM/Intel [2].


BR,
Jani.

[1] http://cgit.freedesktop.org/~danvet/drm-intel/commit/?id=f30d26e468322b50d5e376bec40658683aff8ece
[2] https://01.org/linuxgraphics/documentation/how-report-bugs-0

>
>
>        CPU   Intel(R) Core(TM) i3-3110M CPU @ 2.40GHz 
>        Platform   Intel Ivybridge Chipset 
>        RAM  6 GB DDR3 
>        HDD  Hitachi HTS543232A7A384 ( 320.1 GB) 
>          
>        VGA  Intel Corporation Device [8086:0166] (rev 08) 
>           
>        Audio   Intel Corporation Panther Point High Definition Audio Controller [8086:1e20] (rev 04) 
>        Audio codec   Codec:Codec: Realtek ALC269VB
>        Vendor ID:0x10ec0269
>        Subsystem ID:0x1025064b
>        Revision ID:0x100100 
>
>
>
> Rgds,
> Lawson
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