[Intel-gfx] VGA port is dead on Arrandale chipset

[ykzhao]

On Thu, 2010-03-11 at 21:25 +0800, Stefano Avallone wrote:
> On Thursday 11 March 2010 12:59:35 Thomas Bächler wrote:
> > I am using Linux 2.6.33 and xf86-video-intel 2.10 with 
> latest mesa and
> > libdrm on a Core i5-520M (Xorg.0.log: Chipset "Arrandale").
> > 
> > The xrandr output is as follows by default:
> > 
> > Screen 0: minimum 320 x 200, current 1366 x 768, maximum 
> 8192 x 8192
> > VGA1 disconnected (normal left inverted right x axis y axis)
> > LVDS1 connected 1366x768+0+0 (normal left inverted right x 
> axis y axis)
> > 0mm x 0mm
> >    1366x768       60.2*+
> >    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
> > HDMI1 disconnected (normal left inverted right x axis y 
> axis)
> > DP1 disconnected (normal left inverted right x axis y axis)
> > HDMI2 disconnected (normal left inverted right x axis y 
> axis)
> > DP2 disconnected (normal left inverted right x axis y axis)
> > 
> > Enabling the VGA1 port seems to work just fine: Resolutions 
> are properly
> > detected and the desktop is adjusted, xrandr shows VGA1 as 
> active
> > afterwards. However, there is no picture, the screen stays 
> dead (as in
> > "no signal"). HDMI2 and DP2 seem to work fine as far as I 
> can see.
> > What's going on here?

Hi, Thomas
    Will you please try to specify the refresh rate as Stefano mentioned
and see whether the VGA output can work?

Anyway, it will be great if you can open a new bug  on
bugs.freedesktop.org(Product=xorg, component = driver/intel) and attach
the following info:
      1. Xorg.0.log
      2. xrandr -q --verbose
 

please also attach the output of intel_reg_dumper on your box. The
intel_reg_dumper tool is included in intel_gpu_tool,
which can be downloaded from:
   >http://xorg.freedesktop.org/archive/individual/app/ or the latest
code at git://anongit.freedesktop.org/git/xorg/app/intel-gpu-tools

Please also attach the output of vbios.dump on your box, which can be
obtained by using the following command:
    1. echo 1 > /sys/devices/pci0000:00/0000:00:02.0/rom
    2. cat /sys/devices/pci0000:00/0000:00:02.0/rom >vbios.dump
    3. echo 0 > /sys/devices/pci0000:00/0000:00:02.0/rom

Thanks.

> 
> Looks like the same problem I had and reported here:
> 
> http://bugs.freedesktop.org/show_bug.cgi?id=26840
> 
> Yakui suggested to specify the refresh rate:
> 
> xrandr --output VGA1 --mode 1024x768 --refresh 60
> 
> and it worked. Without specifying the refresh rate, I get a 
> "dead" screen, too.
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