Dual Output on Mobility Radeon HD 3470

Alex Deucher alexdeucher at gmail.com
Tue Jan 5 07:04:11 PST 2010

On Mon, Jan 4, 2010 at 12:58 PM, Richard Palmer
<richard.d.palmer at kcl.ac.uk> wrote:
> Hi,
>        I have two Dell 20" monitors connected to a Mobility Radeon
>        HD 3470 card using DisplayPort to DVI adaptor cables. I can happy
>        use either monitor, but not both together. xrandr lets me
>        switch between them, showing different parts of the virtual desktop
>        (with compiz enabled), but I haven't found any way to get it to
>        show both. Should this be working? (I've found reports of similiar
>        problems in the past on the list but no conclusions); if it should,
>        any idea on what settings I need to change in the config file?.
>        I'm built the latest drivers from git and my xorg.conf and
>        Xorg.log are attached.

Does forcing a dpms cycle (xset dpms force off) help?  Also, you might
have better luck with xf86-video-ati from git master as 6.12.4 does
not have full support for displayport.


> Many thanks,
> Richard
> --
> Richard Palmer                  | Centre for E-Research &
> Systems Manager                 | Centre for Computing in the Humanities
> richard.d.palmer at kcl.ac.uk      | King's College London
> Tel: 0207 848 1973
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