fglrx in dual head mode

[mrtom852]

Hi!

I'm trying to use my laptop (macbook pro) with an external screen for a presentation and would like to use the full resolution of the screen if possible (it does 1080p video - so should get some pretty high resolutions).
In 'big desktop' mode I only seem to be able to get the same resolution as the built in screen 1440x900.

In dual head configuration I can have two different resolutions but I lose 3D - glxinfo and glxgears just hang. Should this work?

My gnome setup has compiz on by default (I can't seem to disable it in Debian) if this makes a difference. As a result I also have no window decorations.

Is there anything I might be able to do or are these known issues? (I'm using 8.47.3)

Thanks!
Tom

[mrplow]

I haven't been able to ever get dualhead with the ati drivers working with seperate resolutions. The opensource driver is relativly easy to setup in dual head mode with different resolutions with xrandr

[mrtom852]

I should have quite while I was ahead. I changed something else and now 3D won't work at all!

Something to do with amdpcsdb but I give up now.

[cinamax]

I tried the samething with GEFORCE FX5600 and X1650Pro on the exact same system/OS. X1650Pro won't work with dual head at all. I can only get them to mirror the two screens.

FX5600 worked quite well with dual heads with extended desktop mode but it is noticeably slower in one of the monitors.

I'm wondering if I should have bought a GeForce 7600 GT instead.