Intel 2.0.0 driver not seeing laptop screen resolutions properly

Dave Airlie airlied at
Tue May 8 22:29:24 PDT 2007

> In any case, we should certainly add config options that can control
> which method (video reg vs BIOS) we use for the initial mode selection.
> Can we get the driver to pull both the current timing mode *and* the
> BIOS mode and then use some logic to select between them? It seems like
> we could tell which was more sensible most of the time...
> One thing seems clear -- we should update Arjan's BIOS stuff to complain
> if the LVDS doesn't offer EDID. That's the only reliable source of
> information which doesn't disappear after S3 and which isn't subject to
> random BIOS bugs in how the text mode is configured.

Nearly every embedded system I've seen doesn't provide EDID on LCD as
it costs 2c more, for two extra tracks and an edid chip, there is
nothing in the Intel design docs mandating this either,... usually the
dev BIOSes just provide a list of screen types you can pick from...


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