Comment 4 for bug 196596

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Bryce Harrington (bryce) wrote :

Ideally, xserver should be able to automatically select the right driver (and options) when switching, if no xorg.conf is present. In testing, though, it appears that the hardware's edid information is not getting read (ddcprobe returns 'edidfail').

So, could you also attach your /var/log/Xorg.0.log, and the (binary) output of get-edid (from the read-edid package)?