Re: BUG: fb_imageblit called before fb_check_var and fb_set_par function

["Antonino A. Daplas" <adaplas@gmail.com>]

Knut Petersen wrote:
> Hi everybody,
> 
> under certain circumstances the X trident driver does disable mmio
> upon returning to a linux console. As mapped ioports are no longer
> available, this is an immediate problem.
> 
> I never had expected that upon switching from X to a linux console
> drawing functions like fb_imageblit would be called before the
> fb_check_var and  fb_set_par functions have been called. But that´s
> definitely the case.
> 

I'm surprised.  That was a problem in earlier versions of the kernel
but I think that was fixed.  If you look at fbcon code, all calls to
drawing functions:

putcs, bmove, scroll, cursor, flashcursor, etc has an 

if (fbcon_is_inactive()) in the beginning.

And everytime the vt switches from KD_GRAPHICS to KD_TEXT (ie from X),
a set_var()/ set_par() will be called automatically to reset the fbdev
drivers before the "drawing" functions are called.

Can you instrument where this is happening?  Because if it still is,
then that is a show-stopping bug.

Tony 


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