Re: Restoring Screen when coming back from KD_GRAPHICS

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

> I'll take a look.  This fits well with what I'm trying to do with the 
> mode switching between virtual terminals.  The callback will definately 
> be neccessarry to tell the driver to save any driver specific data that 
> I'm not already saving (ie anything that's not defined in fb.h).

I don't think we need to "save" anything, there is no way I want any
knowledge of fbcon-specific stuff to go back into fbdev's, it was
hard enough to split these properly (that's a good thing James did).

I think we just need to instruct the fbdev to restore it's mode via
a set_var with an activate flag FB_ACTIVATE_FORCE, that bypass any
test inside the driver about the mode changing from the current info-var,
that is basically forcing it to re-apply it's current var. Most drivers
will also reset the accel engine properly if any when doing so.

Ben.




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