Bug#508066: xserver-xorg-video-radeon: external display not work on ATI Technologies Inc Radeon Mobility U1

["Alex Deucher" <alexdeucher@gmail.com>]

On Mon, Dec 8, 2008 at 3:57 PM, Robert Heel <reportbug@bobosch.de> wrote:
> Brice Goglin schrieb:
>>
>> Can you try upgrading xserver-xorg-core and xserver-xorg-video-radeon to
>> experimental and see if it helps? We have Xserver 1.5.3 and much more
>> recent Radeon driver there.
>>
>> Brice
>>
>
> Thanks Brice,
>
> works a little bit better now:
> - If external display is connected, the internal display has the correct resolution
> - xrandr shows both displays with the same resolution
>
> But external port not activated (display shows "No signal"). Display works fine before X starts.
>
> ===== xrandr -q
>
> Screen 0: minimum 320 x 200, current 1024 x 768, maximum 1600 x 1200
> VGA-0 connected 1024x768+0+0 (normal left inverted right x axis y axis) 376mm x 301mm
>  1280x1024      60.0 +   75.0     75.0     60.0     60.0
>  1600x1024      60.2
>  1400x1050      60.0
>  1440x900       59.9
>  1280x960       60.0
>  1360x768       59.8
>  1280x800       60.0
>  1152x864       75.0     75.0     75.0     70.0     60.0     60.0
>  1024x768       75.0     75.1     75.0     70.1     60.0     60.0*
>  832x624        74.6
>  800x600        72.2     75.0     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+0 (normal left inverted right x axis y axis) 0mm x 0mm
>  1024x768       60.0*+   60.0
>  800x600        60.3
>  640x480        59.9
> S-video disconnected (normal left inverted right x axis y axis)

Perhaps the mode getting picked for the VGA port is one the card
doesn't like. Do any other modes on the VGA port work? E.g.:
xrandr --output VGA-0 --mode 1280x1024

Alex