> The switch should anyways, unless there's insufficient memory for double
> buffering.

I think the "CreateSurface's switch" is done only in the fb device,
but not actually in the screen. That is, the fb geometry is changed to
720x576 but the resolution I see in my monitor is 640x480.

> Check if the driver blocks virtual resolutions.

Umm, maybe that's the point. The "original" driver blocks virtual
resolution, I changed driver's code to avoid that block becouse I need
double buffering (I also added a panning function) and now "fbset
-vyres 1152" returns the correct geometry when I do a "fbset" (720 576
720 1152). Maybe I didn't do all the changes needed to avoid the block
of virtual resolutions.

Thank you very much indeed.
Best regards,
Carlos

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