Re: [PATCH] fbdev: workaround for broken X servers

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

On Friday 05 November 2004 20:58, Geert Uytterhoeven wrote:
> On Fri, 5 Nov 2004, Antonino A. Daplas wrote:
> > On Friday 05 November 2004 20:15, Geert Uytterhoeven wrote:
> > > On Fri, 5 Nov 2004, Benjamin Herrenschmidt wrote:
> > > > > But every existing application that uses (shiver) the kernel
> > > > > headers will break after this change...
> > > >
> > > > Geert, can you explain the whole story please ?
> > >
> > > The story about the +1 or the story about the breakage?
> > >
> > > The Story About The +1
> > > ----------------------
> > > Since the VESA levels do not provide a way to blank (`make it black')
> > > the screen, the +1 is introduced. Hence 0 means unblank, 1 means black
> > > screen, 2 means lowest power save level, and so on...
> >
> > And make it black is usually done in software (by memsetting the screen
> > with the black color).
>
> Or by setting all color palette registers to black, if available, since
> it's cheaper...
>

Ok. So, if pseudocolor/directcolor, set palette to all black, otherwise memset
the screen.

Tony




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