[Intel-gfx] LVDS output not working (anymore)

[Oliver Seitz]

>> I'm using intel D945GSEJT boards, connected to industrial LVDS panels
>> without EDID or the like.

>> Now, on debian 6.0, LVDS output does not show up in xrandr's output list
>> anymore. I understand that there have been some recent changes that are
>> not fully applied to debian 6.0. Is there a way to activate the LVDS output?
>
> Please tell us more! Perhaps a debug log or two? A description of the
> physical encoders and connectors?

I'm happy to provide all information that may be needed, but as I'm new 
to helping in driver debugging, I do not know what may be helpful...

The board employs a 945GSE chip which is already equipped with LVDS 
output. http://ark.intel.com/chipset.aspx?familyID=35553
The LVDS output is avaiable on the board via header connector. 
http://download.intel.com/support/motherboards/desktop/d945gsejt/sb/e77911001.pdf
(This document chooses not to mention the type of the connector, though. 
It is a JST-SHDR-30)

I have only connected channel A clock and data, and the power lines to a 
NEC TFT display. EDID/DDC lines are open.

This setup worked on some old ubuntu (can't remember the version) 
out-of-the-box. When KMS was introduced, it stopped working, as KMS did 
not activate LVDS, probably due to the missing EDID info. "nomodeset" 
did the trick since then, as X saw the LVDS option and xrandr was able 
to activate it:

$ xrandr
  Screen 0: minimum 320 x 200, current 1360 x 1536, maximum 2048 x 2048
  VGA connected 1360x768+0+0 (normal left inverted right x axis y axis) 
34mm x 19mm
     1360x768       60.0*+
     1600x1024      60.0
     1280x1024      60.0
     1440x900       60.2
     1280x960       60.0
     1280x800       60.0
     1152x864       75.0
     1280x768       60.0
     1280x720       74.8     59.9
     1024x768       75.1     70.1     60.0
     832x624        74.6
     800x600        72.2     75.0     60.3     56.2
     640x480        75.0     72.8     72.8     75.0     66.7     60.0 
   59.9
     720x400        70.1
  LVDS connected 1024x768+0+768 (normal left inverted right x axis y 
axis) 0mm x 0mm
     2048x1536      85.0     75.0     60.0
     1920x1440      85.0     75.0     60.0
     1856x1392      75.0     60.0
     1792x1344      75.0     60.0
     1920x1200      72.8     60.0
     1600x1200      85.0     75.0     70.0     65.0     60.0
     1680x1050      60.0
     1600x1024      60.0
     1400x1050      85.3     74.8     70.0     60.0
     1280x1024      85.0     75.0     60.0
     1440x900       60.2
     1280x960       85.0     60.0
     1280x800       60.0
     1152x864       85.1     75.0
     1280x768       60.0
     1152x768       54.8
     1024x768       85.0*    75.0     70.1     60.0
     832x624        74.6
     800x600        85.1     72.2     75.0     60.3     56.2
     640x480        85.0     72.8     75.0     59.9
     720x400        85.0
     640x400        85.1
     640x350        85.1
  TMDS-1 disconnected (normal left inverted right x axis y axis)
  TV disconnected (normal left inverted right x axis y axis)

Now I'm trying debian squeeze (stable), and LVDS is not mentioned by 
xrandr anymore, even when the kernel is forced to stay in text mode at 
boot (by blacklisting i915 or removing the i915 fb config file)

I have to admit that I have not tried the latest X server nor the latest 
intel drivers. I have only tried 2.6.37 kernel, which gave no improvement.

> So, drm.debug=0xe dmesg and Xorg.0.log for the old working UMS setup and
> the broken KMS installation would have been a useful first step.

I'll try to remember that for the future. This time this "first step" 
will be a bit delayed and done in little sub-steps, sorry ;-)

Greets,
Kiste

P.S.: I hope it is the correct style to send the logs as attachments 
untarred and un-gzipped. I apologize if it is not.
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