Bug#439322: xserver-xorg-video-ati: xrandr does not detect VGA monitor

[Alex Deucher]

On 8/24/07, Marcus Better <marcus at better.se> wrote:
> Package: xserver-xorg-video-ati
> Version: 1:6.7.191-1
> Severity: normal
>
> I am trying to enable an external VGA monitor for dual-head on my LG
> LE50 Express laptop (Radeon Xpress 200M), but cannot seem to configure
> it with xrandr:
>
> ~$ xrandr
> Screen 0: minimum 320 x 200, current 1024 x 768, maximum 2048 x 768
> VGA-0 disconnected (normal left inverted right x axis y axis)
> LVDS connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
>    1024x768       60.0*+
>    800x600        60.3
>    640x480        59.9
> S-video disconnected 800x600+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
>   800x600 (0x4b)   38.2MHz
>         h: width   800 start  832 end  912 total 1024 skew    0 clock   37.4KHz
>         v: height  600 start  603 end  607 total  624           clock   59.9Hz
>
> ~$ xrandr --output VGA-0 --mode 1024x768 --right-of LVDS
> xrandr: cannot find mode 1024x768
>

First make sure you grab the latest version from git, Dave fixed some
issues with the tvdac sharing last night.  The driver was not able to
get any edid info from the VGA port so it does not know what modes to
add.  As such you will have to manually add the modes you want to use
to that output.  You will need the latest release of xrandr (1.2.2) to
do this.

xrandr --addmode VGA-0 1024x768
xrandr --output VGA-0 --mode 1024x768

Alex