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

[Stefano Avallone]

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?


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.